rooms for typists or telephone switchboard operators. Two other notable rooms include the Transatlantic Telephone Room and Churchill's office-bedroom. From 1943, a SIGSALY code-scrambling encrypted telephone was installed in the basement of Selfridges, Oxford Street connected to a similar terminal in the Pentagon building. This enabled Churchill to speak securely with American President Roosevelt in Washington, with the first conference taking place on 15 July 1943. Later extensions were installed to both 10 Downing Street and the specially constructed Transatlantic Telephone Room within the Cabinet War Rooms. Churchill's office-bedroom included BBC broadcasting equipment; Churchill made four wartime broadcasts from the Cabinet War Rooms. Although the office room was also fitted out as a bedroom, Churchill rarely slept underground, preferring to sleep at 10 Downing Street or the No.10 Annexe, a flat in the New Public Offices directly above the Cabinet War Rooms. His daughter Mary Soames often slept in the bedroom allocated to Mrs Churchill. Abandonment and preservation After the end of the war, the Cabinet War Rooms became redundant and were abandoned. Their maintenance became the responsibility of the Ministry of Works. In March 1948 the question of public access to the War Rooms was raised in Parliament and the Minister responsible, Charles Key MP, considered that 'it would not be practicable to throw open for inspection by the general public accommodation which forms part of an office where confidential work is carried on'. Even so, a tour was organised for journalists on 17 March, with members of the press being welcomed by Lord Ismay and shown around the Rooms by their custodian, Mr. George Rance. While the Rooms were not open to the general public, they could be accessed by appointment, with access being restricted to small groups. Even so, by the 1970s (with responsibility for the Rooms having passed to the Department for the Environment in 1975) tens of thousands of requests to visit the Rooms were being received every year, of which only 5,000 were successful. Meanwhile, the atmospheric conditions of the site, being dry and dusty, were having a detrimental effect on the rooms' furnishings and historic maps and other documents. The prospect was raised of decanting the contents of the Rooms to an established museum, with the National Army Museum and Imperial War Museum being suggested as candidates. In the event, £7,000 was secured to conserve the material in situ. Opening and redevelopment In