Liddiard was born on the 8th of August 1922 and, in his youth, lived at Egham, a small place on the River Thames, next to Runnymede. His father worked on the Southern Railway as a Mechanical Lineman and was an active member of the NUR. Frank’s father was also an active member of the local Labour Party, in fact its first candidate to stand in the town in the 1920s, but became disillusioned by the Ramsay MacDonald betrayal and refused to have anything more to do with Labour.
The young Frank won a scholarship when he was eleven, in 1933, and went to the local endowed secondary school, which was called Strode. His first job was as a telegraphist at the Post Office in Staines in November 1938, the start of a 41-year career in the civil service.
He was involved in forming a YCL group in Staines, which had been nurtured by the
Chief Shop Steward at Lagonda Motors, who was also a leading local Communist.The group decided - as there was no such thing in Staines - that it should start agitating for the setting up of a youth club. Deputed to send a letter of protest to the local paper, Lilliard found himself hauled up before the Head Postmaster when it was printed.
Having escaped retribution, Frank’s activity focused on the People’s Convention, which was focused on opposing the character of what would become the Second World War, especially the war profiteering and lack of air raid protection for civilians.
Frank Liddiard joined the Communist Party in 1942 and was a local activist in the Union of Post Office Workers. Later, he moved from the Post Office to work in the Treasury and then the Ministry of Housing and Local Government. He became the president, or national chair, of a civil servant's union (possibly the Civil Service Union) before being witch-hunted out.
He is still an active branch member in Cambridge of the Communist Party, active in the National Pensioners’ Convention, and an executive member of the Cuba Solidarity Campaign.