@Ragman,
Yep, like many thesps, he lost it all by various means, but at one time (around the time of the "those magnificent men " type films) he was one of the highest paid actors in the world.
I don't know whether you got the Wacky Races cartoon series over there, but it was massive here for many years, and the baddie "Dick Dastardly" was totally based on Terry Thomas.
He left the cricket ground that day after several drinks, very red in the face and chauffeur driven in a banana yellow E-Type Jag, which proceeded to hit a parked police car on the way out.