Floud was elected to Parliament in the
1964 general election for
Acton, gaining the marginal seat from the
Conservatives with a majority of 2,599, and was re-elected in 1966 with an increased majority of 4,941. He was depressed after the death of his wife Ailsa after a long illness in January 1967 (
Christopher Andrew erroneously states in the first edition of his book and on the basis of MI5 files that she committed suicide; this statement was removed from the second edition), and he too had suffered from ill-health for some time. In March he agreed to undergo psychiatric treatment, but had a relapse in June, and after a holiday in August he returned to his constituency work.
Harold Wilson had mentioned that he was considering appointing Floud to the government, and
MI5 was asked to approve his
security clearance. Although Wilson had a standing policy to deny MI5 the right to interrogate MPs, the service strenuously objected; Wilson subsequently allowed an interrogation after being sent a brief on Floud. Floud had been friends with many
Communists while at
Oxford, and was directly named by two separate inactive agents as having worked as a spy in the past, handling recruitment. The interrogation by
Peter Wright was intense, lasting two days and producing neither an admission nor denial of guilt, even when Wright explained that without any further clarification on the matter, MI5 would be forced to deny him the clearance for the appointment. He returned to work shortly after the conclusion of the second day of questioning, but upon leaving his office at
Granada Television he said he was "unable to go on". The next day, 10 October 1967, he killed himself allegedly by taking an overdose of
barbiturates and also
gassing himself with carbon monoxide at his
St Pancras home. He was 52 years old. Acton was regained by the Conservative
Kenneth Baker in the subsequent
by-election in March 1968. ==Accusations of espionage==