1958 US–UK Mutual Defence Agreement as an atomic spy, caused the proposal to be dropped. The June 1951 defection of Donald Maclean, who had served as a British member of the Combined Policy Committee from January 1947 to August 1948, reinforced the Americans' distrust of British security arrangements. The first British atomic bomb was successfully tested in Operation Hurricane on 3 October 1952, but although it was more advanced than the American bombs of 1946, Britain was still several years behind in nuclear weapons technology. The United States conducted Ivy Mike, the first nuclear test of a true thermonuclear device (also known as a hydrogen
Life in the United Kingdom test based on factual information about what the test required, and in particular a semi-serious BBC-devised test was often quoted as being the real thing. Upon its publication, the associated handbook was widely criticised. Particular criticism was reserved for the section on the UK's history, which was described by the "Guardian" as a "turgid, abysmal piece of writing," filled with "factual errors, sweeping generalisations [and] gross misrepresentations." The UK Border Agency acknowledged that the first edition of the handbook "did not fulfil [its] role particularly well." In 2008, Lord Goldsmith stated in a report on citizenship that the test "is not