Council of Civil Service Unions v Minister for the Civil Service (GCHQ) is a British intelligence agency that provides signals intelligence to the British government and armed forces. Prior to 1983 its existence was not acknowledged, despite the fact that it openly recruited graduates. Following a spy scandal in 1983, the organisation became known to the public, and the government of Margaret Thatcher decided a year later that employees would not be allowed to join a trade union for national security reasons. The Minister for the Civil Service is a position held "ex officio" by the Prime Minister. This was done through an Order in Council, an exercise of the Royal
Civil Service (United Kingdom) Crown working in a civil capacity who is not the holder of a political (or judicial) office; the holder of certain other offices in respect of whose tenure of office special provision has been made; [or] a servant of the Crown in a personal capacity paid from the Civil List". As such, the civil service does not include government ministers (who are politically appointed), members of the British Armed Forces, the police, officers of local government authorities or quangos of the Houses of Parliament, employees of the National Health Service (NHS), or staff of the Royal Household. As at the