He turned to professional ballroom dancing, found work in films as an extra and performed comedy monologues, as well as impersonations in night clubs and cabaret.. The onset of World War II put his burgeoning career on hold. He enlisted in the Army Signals Corps rising to the rank of sergeant. Between 1940 and 1942, Terry participated in the ENSA program, staging his own shows "Cabaret Parade" and "Stars in Battledress". It was at this time, that he first adopted the affected mannerisms, which later became his stock-in-trade. He also demonstrated an amazing repertoire for imitating popular vocalists and for recreating all types of sound effects with his voice.
In July 1946, Terry joined the cast of the revue "Piccadilly Hayride" and suddenly became the comic discovery of the year, which ended with a Royal Variety Performance in front of King and Queen. His proper breakthrough, though, came via his radio show "To Town with Terry" (and its sequel), aired on the BBC Home Service from October 1948. This opened many doors, including Terry getting his own TV series, How Do You View? (1949).
During 1949 he appeared in a cameo role as himself in the mad-cap comedy Helter Skelter (pictured).
After a brace of nondescript roles, he was finally cast as the effete, derisive Major Hitchcock in the first of several films produced by the Boulting brothers, Private's Progress (1956). For several years after, Terry's popularity flourished with similar films taking a jaundiced view of British institutions.
Such films include Lucky Jim (1957), Blue Murder at St. Trinian's (1957), Tom Thumb (1958), starred as the titular Carlton-Browne of the F.O. (1959), I’m All Right Jack (1959), School for Scoundrels (1960) and Those Magnificent Men in Their Flying Machines (1965).
He came to epitomise the archetypal British 'silly ass' -- an instantly recognisable figure replete with RAF-style moustache, cheeky gap-toothed grin, mobile eyebrows, flashy waistcoats, button-hole carnation, suede shoes and enormous cigarette holders (including one studded with 42 diamonds!). Life imitated art, when it came to womanising, clothing and accessories. Terry, a founding member of the London Waistcoat Club, ended up owning more than 150 of these garments, in addition to 80 Savile Row bespoke suits.
Terry-Thomas died in Godalming, Surrey, on 8th January 1990 at the age of 78.