The decision to proceed was formally made on 8 January 1947 at a meeting of Gen 163, a subcommittee of the Gen 75 Committee consisting of six Cabinet members, including Attlee, and was publicly announced in the House of Commons on 12 May 1948. D notice No. 25 prohibited the publication of details on the design, construction or location of atomic weapons. The project was given the cover name "High Explosive Research". As Chief Superintendent Armament Research (CSAR, pronounced "Caesar"), Penney directed bomb design from Fort Halstead. In 1951, his design group moved to a new site at Aldermaston in Berkshire.