Gareth Wyn Williams (26 September 1978 – c. 16 August 2010) was a Welsh mathematician and Junior Analyst for GCHQ on secondment to the Secret Intelligence Service (SIS or MI6) who was found dead in suspicious circumstances in Pimlico, London, on 23 August 2010, at a flat used to house Security Service's staff.

MI5 (Military Intelligence, Section 5), [2] officially the Security Service, is the United Kingdom's domestic counter-intelligence and security agency and is part of its intelligence machinery alongside the Secret Intelligence Service (MI6), Government Communications Headquarters (GCHQ), and Defence Intelligence (DI).

2023年4月16日 · The UK has three distinct intelligence gathering agencies, MI5, MI6 and GCHQ. Each plays a key role in protecting the country from threats both domestic and foreign. Despite often being confused with each other, they all have quite different responsibilities and serve a unique purpose.

GCHQ has a long history of co-operation with the Security Service (also known as MI5) and the Secret Intelligence Service (MI6). These agencies work together to gather intelligence and conduct...

The UK’s Intelligence Services – made up of MI5, MI6 and GCHQ – work together to protect Britain’s people, interests and businesses from threats at home, overseas and online. And to help...

The four main agencies are the Secret Intelligence Service (SIS or MI6), the Security Service (MI5), the Government Communications Headquarters (GCHQ) and Defence Intelligence (DI). The agencies are organised under three government departments , the Foreign Office , the Home Office and the Ministry of Defence .

2023年4月16日 · The three organizations that make up the UK government security services are MI5, MI6 and GCHQ. Although they are all part of the same system, each organization has its own independent functions. MI5 is responsible for protecting Britain from threats to national security such as terrorism and espionage within the UK.

We work closely with other UK agencies and organisations that are involved in dealing with overseas threats to the UK. We have a close working relationship with our sister UK intelligence agencies,...

2024年7月25日 · MI5 works alongside GCHQ (Government Communications Headquarters), Defence Intelligence, and the Secret Intelligence Service. Headed by the Joint Intelligence Committee, MI5 is tasked to protect and preserve British parliamentary democracy and its economic interests.