Until 1992, the list of cabinet committees, their membership, and their terms of reference were secret, with rare exceptions. During the Second World War, details of the War Cabinet structure were communicated to Parliament; Winston Churchill had previously announced a Standing Committee on National Expenditure in his 1925 Budget statement. The existence and membership of the Defence and Overseas Policy Committee was announced in 1963, coinciding with the amalgamation of the service ministries into a single Ministry of Defence. Margaret Thatcher confirmed the continuing existence of this committee in the House of Commons in 1979, along with standing committees for Economic Strategy, Home and Social Affairs, and Legislation. The secrecy was due to the concern that public knowledge of Cabinet procedure would lead to a loss of faith in collective responsibility (if it became known that only a subset of the Cabinet had been involved in making a given decision) and undue pressure being put on committee chairs once their specific policy responsibilities became known. Whether decisions were made by the entire Cabinet, or by a committee, is not revealed at present.