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73-513: Government Communications Headquarters ( GCHQ ) is an intelligence and security organisation responsible for providing signals intelligence (SIGINT) and information assurance (IA) to the government and armed forces of the United Kingdom . Primarily based at " The Doughnut " in the suburbs of Cheltenham , GCHQ is the responsibility of the country's Secretary of State for Foreign and Commonwealth Affairs (Foreign Secretary), but it

146-535: A KGB mole within it, created considerable media interest. In 1984, GCHQ was the centre of a political row when, in the wake of strikes which affected Sigint collection, the Conservative government of Margaret Thatcher prohibited its employees from belonging to a trade union, asserting that membership of a union was in conflict with national security . The government offered £1,000 to each employee who agreed to give up their right to union membership. Following

219-437: A FOX media segment. The US government formally apologised for the unfounded allegations and promised they would not be repeated. British intelligence did gather information relating to Russian contacts made by Trump's campaign team in the run-up to his election, which were passed on to US intelligence agencies. On 31 October 2018, GCHQ joined Instagram . GCHQ personnel are recognised annually by King Charles III (formerly

292-553: A US court order before disclosing data. However the head of the UK technology industry group techUK rejected these claims, stating that they understood the issues but that disclosure obligations "must be based upon a clear and transparent legal framework and effective oversight rather than, as suggested, a deal between the industry and government". In 2015, documents obtained by The Intercept from US National Security Agency whistleblower Edward Snowden revealed that GCHQ had carried out

365-583: A conference slideshow presented by the GCHQ. Soon after becoming Director of GCHQ in 2014, Robert Hannigan wrote an article in the Financial Times on the topic of internet surveillance , stating that "however much [large US technology companies] may dislike it, they have become the command and control networks of choice for terrorists and criminals" and that GCHQ and its sister agencies "cannot tackle these challenges at scale without greater support from

438-500: A group of 14 former GCHQ employees, who had been dismissed after refusing to give up their union membership, were offered re-employment, which three of them accepted. The legal case Council of Civil Service Unions v Minister for the Civil Service is significant beyond the dispute, and even beyond trade union law, in that it held for the first time that the royal prerogative is generally subject to judicial review , although

511-452: A mass-surveillance operation, codenamed KARMA POLICE , since about 2008. The operation swept up the IP address of Internet users visiting websites, and was established with no public scrutiny or oversight. KARMA POLICE is a powerful spying tool in conjunction with other GCHQ programs because IP addresses could be cross-referenced with other data. The goal of the program, according to the documents,

584-463: A peacetime codebreaking agency should be created, a task which was given to the Director of Naval Intelligence , Hugh Sinclair . Sinclair merged staff from NID25 and MI1b into the new organisation, which initially consisted of around 25–30 officers and a similar number of clerical staff. It was titled the "Government Code and Cypher School" (GC&CS), a cover-name which was chosen by Victor Forbes of

657-531: A report by management consultant group Collinson Grant was made public by Andrew Mackinlay . The report severely criticised the FCO's management structure, noting: The Foreign Office commissioned the report to highlight areas which would help it achieve its pledge to reduce spending by £87 million over three years. In response to the report being made public, the Foreign Office stated it had already implemented

730-469: A result of the cuts. The cuts had been mostly reversed by 2000 in the wake of threats from violent non-state actors , and risks from increased terrorism, organised crime and illegal access to nuclear, chemical and biological weapons. David Omand became the Director of GCHQ in 1996, and greatly restructured the agency in the face of new and changing targets and rapid technological change. Omand introduced

803-482: A review of the FCO's strategic priorities. One of the key messages of these discussions was the conclusion that the existing framework of ten international strategic priorities, dating from 2003, was no longer appropriate. Although the framework had been useful in helping the FCO plan its work and allocate its resources, there was agreement that it needed a new framework to drive its work forward. The new strategic framework consists of three core elements: In August 2005,

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876-470: Is co-located with GCHQ for administrative purposes. In 2013, GCHQ received considerable media attention when the former National Security Agency contractor Edward Snowden revealed that the agency was in the process of collecting all online and telephone data in the UK via the Tempora programme. Snowden's revelations began a spate of ongoing disclosures of global surveillance . The Guardian newspaper

949-675: Is led by the Director of GCHQ, Anne Keast-Butler , and a Corporate Board, made up of executive and non-executive directors. Reporting to the Corporate Board are: During the First World War, the British Army and Royal Navy had separate signals intelligence agencies, MI1b and NID25 (initially known as Room 40) respectively. In 1919, the Cabinet's Secret Service Committee, chaired by Lord Curzon , recommended that

1022-739: Is not a part of the Foreign Office and its director ranks as a Permanent Secretary . GCHQ was originally established after the First World War as the Government Code and Cypher School ( GC&CS ) and was known under that name until 1946. During the Second World War it was located at Bletchley Park , where it was responsible for breaking the German Enigma codes . There are two main components of GCHQ,

1095-660: Is responsible for representing and promoting British interests worldwide. The head of the FCDO is the secretary of state for foreign, Commonwealth and development affairs , commonly abbreviated to "foreign secretary". This is regarded as one of the four most prestigious positions in the Cabinet – the Great Offices of State – alongside those of Prime Minister , Chancellor of the Exchequer and Home Secretary . David Lammy

1168-730: Is that GCHQ and its US equivalent, the National Security Agency (NSA), share technologies, infrastructure and information. GCHQ ran many signals intelligence (SIGINT) monitoring stations abroad. During the early Cold War , the remnants of the British Empire provided a global network of ground stations which were a major contribution to the UKUSA Agreement; the US regarded RAF Little Sai Wan in Hong Kong as

1241-727: Is the ministry of foreign affairs and a ministerial department of the Government of the United Kingdom . The office was created on 2 September 2020 through the merger of the Foreign and Commonwealth Office (FCO) and the Department for International Development (DFID). The FCO was itself created in 1968 by the merger of the Foreign Office (FO) and the Commonwealth Office . The department in its various forms

1314-477: Is to support efforts to achieve a two-state solution . Funding a particular project for a limited period of time does not mean that we endorse every single action or public comment made by an NGO or by its employees." In September 2012, the FCO and the Canadian Department of Foreign Affairs signed a Memorandum of Understanding on diplomatic cooperation, which promotes the co-location of embassies,

1387-582: The British Army for GCHQ. In March 2010, GCHQ was criticised by the Intelligence and Security Committee for problems with its IT security practices and failing to meet its targets for work targeted against cyber attacks. As revealed by Edward Snowden in The Guardian , GCHQ spied on foreign politicians visiting the 2009 G-20 London Summit by eavesdropping phonecalls and emails and monitoring their computers, and in some cases even ongoing after

1460-638: The Centre for Quantum Computation at Oxford University and the Heilbronn Institute for Mathematical Research at the University of Bristol . In the 21st century, CESG ran a number of assurance schemes such as CHECK, CLAS , Commercial Product Assurance (CPA) and CESG Assisted Products Service (CAPS). In 1970 the concept for public-key encryption ( public key infrastructure ) was developed and proven by GCHQ's James H. Ellis . Ellis lacked

1533-585: The Colonial Office , from 1966 to 1968 by the Commonwealth Office , from 1968 to 2020 by the Foreign and Commonwealth Office , and since 2020 by the Foreign, Commonwealth and Development Office (this did not include protectorates , which fell under the purview of the Foreign Office , or to British India , which had been administered by the East India Company until 1858, and thereafter by

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1606-711: The First World War , the Arab Bureau was set up within the British Foreign Office as a section of the Cairo Intelligence Department . During the early Cold War an important department was the Information Research Department (IRD) which was used to create propaganda against socialist and anti-colonial movements. The Foreign Office hired its first woman diplomat, Monica Milne , in 1946. The FCO

1679-525: The Foreign Office . Alastair Denniston , who had been a member of NID25, was appointed as its operational head. It was initially under the control of the Admiralty and located in Watergate House, Adelphi, London. Its public function was "to advise as to the security of codes and cyphers used by all Government departments and to assist in their provision", but also had a secret directive to "study

1752-535: The India Office ). This arrangement has been subject to criticism in the UK and in the overseas territories. For example, the chief minister of Anguilla , Victor Banks , said: "We are not foreign; neither are we members of the Commonwealth , so we should have a different interface with the UK that is based on mutual respect". There have been numerous suggestions on ways to improve the relationship between

1825-548: The RSA algorithm had been developed (equivalent to Cocks's system) and by 1997 was extremely well established. Intelligence agency Means of information gathering are both overt and covert and may include espionage , communication interception , cryptanalysis , cooperation with other institutions, and evaluation of public sources. The assembly and propagation of this information is known as intelligence analysis or intelligence assessment . Intelligence agencies can provide

1898-732: The Suez War led to the eviction of GCHQ from several of its best foreign SIGINT collection sites, including the new Perkar, Ceylon site and RAF Habbaniya , Iraq. The staff largely moved to tented encampments on military bases in Cyprus, which later became the Sovereign Base Area . During the Cuban Missile Crisis , GCHQ Scarborough intercepted radio communications from Soviet ships reporting their positions and used that to establish where they were heading. A copy of

1971-554: The number theory skills required to build a workable system. In 1974 GCHQ mathematician Clifford Cocks had developed a workable public key cryptography algorithm and a workable PKI system. Cocks's system was not available in the public domain until it was declassified in 1997. By 1997 broader public key cryptography commercial technologies had been independently developed and had become well established, in areas such as email security , digital signatures , and TLS (a fundamental TCP/IP security component) etc. Most notably in 1977

2044-605: The 1920s, GC&CS was successfully reading Soviet Union diplomatic cyphers. However, in May 1927, during a row over clandestine Soviet support for the General Strike and the distribution of subversive propaganda, Prime Minister Stanley Baldwin made details from the decrypts public. During the Second World War, GC&CS was based largely at Bletchley Park , in present-day Milton Keynes , working on understanding

2117-402: The 19th century, it was not infrequent for the Foreign Office to approach The Times newspaper and ask for continental intelligence, which was often superior to that conveyed by official sources. Examples of journalists who specialized in foreign affairs and were well connected to politicians included: Henry Southern , Valentine Chirol , Harold Nicolson, and Robert Bruce Lockhart . During

2190-897: The Army and RAF codebreakers went to the Wireless Experimental Centre in Delhi, India. The Navy codebreakers in FECB went to Colombo , Ceylon, then to Kilindini , near Mombasa , Kenya. GC&CS was renamed the Government Communications Headquarters (GCHQ) in June 1946. The organisation was at first based in Eastcote in northwest London, then in 1951 moved to the outskirts of Cheltenham , setting up two sites at Oakley and Benhall . One of

2263-588: The Colonial Office in 1925. The Foreign and Commonwealth Office held responsibility for international development issues between 1970 and 1974, and again between 1979 and 1997. The National Archives website contains a government timeline to show the departments responsible for foreign affairs from 1945. From 1997, international development became the responsibility of the separate Department for International Development . When David Miliband took over as Foreign Secretary in June 2007, he set in hand

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2336-592: The Composite Signals Organisation (CSO), which is responsible for gathering information, and the National Cyber Security Centre (NCSC), which is responsible for securing the UK's own communications. The Joint Technical Language Service (JTLS) is a small department and cross-government resource responsible for mainly technical language support and translation and interpreting services across government departments. It

2409-706: The FCDO are scrutinised by the Foreign Affairs Select Committee . According to the FCDO website, the department's key responsibilities (as of 2020) are as follows: In addition to the above responsibilities, the FCDO is responsible for the British Overseas Territories , which had previously been administered from 1782 to 1801 by the Home Office , from 1801 to 1854 by the War and Colonial Office , from 1854 to 1966 by

2482-555: The German Enigma machine and Lorenz ciphers . In 1940, GC&CS was working on the diplomatic codes and ciphers of 26 countries, tackling over 150 diplomatic cryptosystems. Senior staff included Alastair Denniston , Oliver Strachey , Dilly Knox , John Tiltman , Edward Travis , Ernst Fetterlein , Josh Cooper , Donald Michie , Alan Turing , Gordon Welchman , Joan Clarke , Max Newman , William Tutte , I. J. (Jack) Good , Peter Calvocoressi and Hugh Foss . The 1943 British–US Communication Intelligence Agreement, BRUSA , connected

2555-771: The Hong Kong stations operations were moved to Australian Defence Satellite Communications Station in Geraldton in Western Australia . Operations that used GCHQ's intelligence-gathering capabilities in the 1990s included the monitoring of communications of Iraqi soldiers in the Gulf War , of dissident republican terrorists and the Real IRA , of the various factions involved in the Yugoslav Wars , and of

2628-605: The House of Lords ruled in favour of the Crown in this instance. The Intelligence Services Act 1994 formalised the activities of the intelligence agencies for the first time, defining their purpose, and the British Parliament's Intelligence and Security Committee was given a remit to examine the expenditure, administration and policy of the three intelligence agencies. The objectives of GCHQ were defined as working as "in

2701-580: The Prince of Wales) at the Prince of Wales's Intelligence Community Awards at St James's Palace or Clarence House alongside members of the Security Service (MI5), and Secret Intelligence Service (MI6). Awards and citations are given to teams within the agencies as well as individuals. As well as a mission to gather intelligence, GCHQ has for a long time had a corresponding mission to assist in

2774-545: The Security Service and SIS (MI5 and MI6). In December 1994 the businessman Roger Hurn was commissioned to begin a review of GCHQ, which was concluded in March 1995. Hurn's report recommended a cut of £100  million in GCHQ's budget; such a large reduction had not been suffered by any British intelligence agency since the end of World War II. The J Division of GCHQ, which had collected SIGINT on Russia, disappeared as

2847-612: The blessing of a same-sex marriage . In 2012, the Foreign Office was criticised by Gerald Steinberg of the Jerusalem-based research institute NGO Monitor , saying that the Foreign Office and the Department for International Development provided more than £500,000 in funding to Palestinian NGOs which he said "promote political attacks on Israel". In response, a spokesman for the Foreign Office said "we are very careful about who and what we fund. The objective of our funding

2920-559: The breakdown of talks and the failure to negotiate a no-strike agreement, a number of mass national one-day strikes were held to protest against this decision, believed by some to be the first step to wider bans on trade unions. Appeals to British courts and the European Commission of Human Rights were unsuccessful. An appeal to the International Labour Organization resulted in a decision that

2993-484: The concept of "Sinews" (or "SIGINT New Systems") which allowed more flexible working methods, avoiding overlaps in work by creating fourteen domains, each with a well-defined working scope. The tenure of Omand also saw the construction of a modern new headquarters, intended to consolidate the two old sites at Oakley and Benhall into a single, more open-plan work environment. Located on a 176-acre site in Benhall, it would be

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3066-518: The criminal Kenneth Noye . In the mid-1990s GCHQ began to assist in the investigation of cybercrime . At the end of 2003, GCHQ moved in to its new building. Built on a circular plan around a large central courtyard, it quickly became known as the Doughnut . At the time, it was one of the largest public-sector building projects in Europe, with an estimated cost of £337 million. The new building, which

3139-445: The following services for their national governments. There is a distinction between "security intelligence" and "foreign intelligence". Security intelligence pertains to domestic threats, including terrorism and espionage. Foreign intelligence involves information collection relating to the political, or economic activities of foreign states. Some agencies have been involved in assassination , arms trafficking , coups d'état , and

3212-591: The government's actions were in violation of Freedom of Association and Protection of the Right to Organise Convention . A no-strike agreement was eventually negotiated and the ban lifted by the incoming Labour government in 1997, with the Government Communications Group of the Public and Commercial Services Union (PCS) being formed to represent interested employees at all grades. In 2000,

3285-563: The handling of this issue was becoming essential to their credibility as an organisation. The Internet had become a "cyber commons", with its dominance creating a "second age of Sigint". GCHQ transformed itself accordingly, including greatly expanded Public Relations and Legal departments, and adopting public education in cyber security as an important part of its remit. In February 2014, The Guardian , based on documents provided by Snowden, revealed that GCHQ had indiscriminately collected 1.8 million private Yahoo webcam images from users across

3358-499: The intelligence agencies should "investigate whether all the functions that GCHQ carries out today are still necessary." In late 1993 civil servant Michael Quinlan advised a deep review of the work of GCHQ following the conclusion of his "Review of Intelligence Requirements and Resources", which had imposed a 3% cut on the agency. The Chief Secretary to the Treasury , Jonathan Aitken , subsequently held face to face discussions with

3431-458: The intelligence agency directors to assess further savings in the wake of Quinlan's review. Aldrich (2010) suggests that Sir John Adye , the then Director of GCHQ performed badly in meetings with Aitken, leading Aitken to conclude that GCHQ was "suffering from out-of-date methods of management and out-of-date methods for assessing priorities". GCHQ's budget was £850 million in 1993, (£2.19 billion as of 2023) compared to £125 million for

3504-817: The intelligence mission of GCHQ relocated to Cheltenham; the Security section remained at Eastcote, and in March 1954 became a separate, independent organisation: the London Communications Security Agency (LCSA), which in 1958 was renamed to the London Communications-Electronic Security Agency (LCESA). In April 1965, GPO and MOD units merged with LCESA to become the Communications-Electronic Security Department (CESD). In October 1969, CESD

3577-481: The interests of national security, with particular reference to the defence and foreign policies of His Majesty's government; in the interests of the economic wellbeing of the United Kingdom; and in support of the prevention and the detection of serious crime". During the introduction of the Intelligence Agency Act in late 1993, the former Prime Minister Jim Callaghan had described GCHQ as a "full-blown bureaucracy", adding that future bodies created to provide oversight of

3650-410: The joint provision of consular services, and common crisis response. The project has been criticised for further diminishing the UK's influence in Europe. In 2011, the then Foreign Secretary, William Hague , announced the government's intention to open a number of new diplomatic posts in order to enhance the UK's overseas network. As such, eight new embassies and six new consulates were opened around

3723-407: The largest building constructed for secret intelligence operations outside the United States. Operations at GCHQ's Chung Hom Kok listening station in Hong Kong ended in 1994. GCHQ's Hong Kong operations were extremely important to their relationship with the NSA, who contributed investment and equipment to the station. In anticipation of the transfer of Hong Kong to the Chinese government in 1997,

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3796-440: The major reasons for selecting Cheltenham was that the town had been the location of the headquarters of the United States Army Services of Supply for the European Theater during the War, which built up a telecommunications infrastructure in the region to carry out its logistics tasks. Following the Second World War , US and British intelligence have shared information as part of the UKUSA Agreement . The principal aspect of this

3869-409: The methods of cypher communications used by foreign powers". GC&CS officially formed on 1 November 1919, and produced its first decrypt prior to that date, on 19 October. Before the Second World War, GC&CS was a relatively small department. By 1922, the main focus of GC&CS was on diplomatic traffic, with "no service traffic ever worth circulating" and so, at the initiative of Lord Curzon, it

3942-420: The most valuable of these. The monitoring stations were largely run by inexpensive National Service recruits, but when this ended in the early 1960s, the increased cost of civilian employees caused budgetary problems. In 1965 a Foreign Office review found that 11,500 staff were involved in SIGINT collection (8,000 GCHQ staff and 3,500 military personnel), exceeding the size of the Diplomatic Service . Reaction to

4015-422: The overseas territories and the UK. Suggestions have included setting up a dedicated department to handle relations with the overseas territories, and the absorption of the Overseas Territories Directorate (OTD) in the Cabinet Office , thus affording the overseas territories with better connections to the centre of government. The FCDO ministers are as follows, with cabinet ministers in bold: The Foreign Office

4088-721: The placement of misinformation propaganda and other covert and clandestine operations to support their own or their governments' interests. Books Journals Foreign Office King Charles III [REDACTED] William, Prince of Wales [REDACTED] Charles III ( King-in-Council ) [REDACTED] Starmer ministry ( L ) Keir Starmer ( L ) Angela Rayner ( L ) ( King-in-Parliament ) [REDACTED] Charles III [REDACTED] [REDACTED] [REDACTED] The Lord Reed The Lord Hodge Andrew Bailey Monetary Policy Committee The Foreign, Commonwealth and Development Office ( FCDO )

4161-399: The private sector", arguing that most internet users "would be comfortable with a better and more sustainable relationship between the [intelligence] agencies and the tech companies". Since the 2013 global surveillance disclosures , large US technology companies have improved security and become less co-operative with foreign intelligence agencies, including those of the UK, generally requiring

4234-466: The protection of the British government's own communications. When the Government Code and Cypher School (GC&CS) was created in 1919, its overt task was providing security advice. GC&CS's Security section was located in Mansfield College, Oxford during the Second World War. In April 1946, GC&CS became GCHQ, and the now GCHQ Security section moved from Oxford to join the rest of the organisation at Eastcote later that year. From 1952 to 1954,

4307-407: The report was sent directly to the White House Situation Room, providing initial indications of Soviet intentions with regards the US naval blockade of Cuba. Duncan Campbell and Mark Hosenball revealed the existence of GCHQ in 1976 in an article for Time Out ; as a result, Hosenball was deported from the UK. GCHQ had a very low profile in the media until 1983 when the trial of Geoffrey Prime ,

4380-438: The report's recommendations. In 2009, Gordon Brown created the position of Chief Scientific Adviser (CSA) to the FCO. The first science adviser was David Clary . On 25 April 2010, the department apologised after The Sunday Telegraph obtained a "foolish" document calling for the upcoming September visit of Pope Benedict XVI to be marked by the launch of "Benedict-branded" condoms , the opening of an abortion clinic and

4453-401: The run-up to the 2003 Iraq war . GCHQ gains its intelligence by monitoring a wide variety of communications and other electronic signals. For this, a number of stations have been established in the UK and overseas. The listening stations are at Cheltenham itself, Bude , Scarborough , Ascension Island , and with the United States at Menwith Hill . Ayios Nikolaos Station in Cyprus is run by

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4526-403: The signal intercept networks of the GC&CS and the US National Security Agency (NSA). Equipment used to break enemy codes included the Colossus computer . Colossus consisted of ten networked computers. An outstation in the Far East, the Far East Combined Bureau , was set up in Hong Kong in 1935 and moved to Singapore in 1939. Subsequently, with the Japanese advance down the Malay Peninsula,

4599-400: The summit via keyloggers that had been installed during the summit. According to Edward Snowden, at that time GCHQ had two principal umbrella programs for collecting communications: GCHQ has also had access to the US internet monitoring programme PRISM from at least as far back as June 2010. PRISM is said to give the National Security Agency and FBI easy access to the systems of nine of

4672-456: The world's top internet companies, including Google, Facebook, Microsoft, Apple, Yahoo, and Skype. From 2013, GCHQ realised that public attitudes to Sigint had changed and its former unquestioned secrecy was no longer appropriate or acceptable. The growing use of the Internet, together with its inherent insecurities, meant that the communications traffic of private citizens were becoming inextricably mixed with those of their targets and openness in

4745-409: The world. In the same month NBC and The Intercept , based on documents released by Snowden, revealed the Joint Threat Research Intelligence Group and the Computer Network Exploitation units within GCHQ. Their mission was cyber operations based on "dirty tricks" to shut down enemy communications, discredit, and plant misinformation on enemies. These operations were 5% of all GCHQ operations according to

4818-442: Was "either (a) a web browsing profile for every visible user on the internet, or (b) a user profile for every visible website on the internet." In 2015, GCHQ admitted for the first time in court that it conducts computer hacking. In 2017, US Press Secretary Sean Spicer made allegations that GCHQ had conducted surveillance on US President Donald Trump . These unfounded claims were based on statements made during an opinion piece in

4891-399: Was appointed Foreign Secretary on 5th July 2024 following the 2024 general election . The FCDO is managed day-to-day by a civil servant , the permanent under-secretary of state for foreign affairs , who also acts as the Head of His Majesty's Diplomatic Service . Sir Philip Barton took office as permanent under-secretary on 2 September 2020. The expenditure, administration and policy of

4964-408: Was designed by Gensler and constructed by Carillion , became the base for all of GCHQ's Cheltenham operations. The public spotlight fell on GCHQ in late 2003 and early 2004 following the sacking of Katharine Gun after she leaked to The Observer a confidential email from agents at the United States' National Security Agency addressed to GCHQ officers about the wiretapping of UN delegates in

5037-478: Was forced to destroy computer hard drives with the files Snowden had given them because of the threats of a lawsuit under the Official Secrets Act. In June 2014, The Register reported that the information the government sought to suppress by destroying the hard drives related to the location of a "beyond top secret" GCHQ internet monitoring base in Seeb , Oman, and the close involvement of BT and Cable & Wireless in intercepting internet communications. GCHQ

5110-408: Was formed in March 1782 by combining the Southern and Northern Departments of the Secretary of State, each of which covered both foreign and domestic affairs in their parts of the Kingdom. The two departments' foreign affairs responsibilities became the Foreign Office, whilst their domestic affairs responsibilities were assigned to the Home Office. The Home Office is technically the senior. During

5183-420: Was formed on 17 October 1968, from the merger of the short-lived Commonwealth Office and the Foreign Office . The Commonwealth Office had been created only in 1966, by the merger of the Commonwealth Relations Office and the Colonial Office , the Commonwealth Relations Office having been formed by the merger of the Dominions Office and the India Office in 1947—with the Dominions Office having been split from

5256-536: Was merged into GCHQ and becoming Communications-Electronic Security Group ( CESG ). In 1977 CESG relocated from Eastcote to Cheltenham. CESG continued as the UK National Technical Authority for information assurance , including cryptography . CESG did not manufacture security equipment, but worked with industry to ensure the availability of suitable products and services, while GCHQ itself funded research into such areas, for example to

5329-511: Was transferred from the Admiralty to the Foreign Office . GC&CS came under the supervision of Hugh Sinclair , who by 1923 was both the Chief of SIS and Director of GC&CS. In 1925, both organisations were co-located on different floors of Broadway Buildings, opposite St. James's Park . Messages decrypted by GC&CS were distributed in blue-jacketed files that became known as "BJs". In

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