From Wikipedia, the free encyclopedia. Thorley Swinstead Walters was an English character actor. He is probably best remembered for his comedy film roles such as in Two-Way Stretch and Carlton-Browne of the FO. He also appeared in the acclaimed TV drama Tinker, Tailor, Soldier, Spy. Walters played Sherlock Holmes sidekick Doctor Watson in four unrelated films: Sherlock Holmes and the Deadly Necklace (1962), The Best House in London (1969), The Adventure of Sherlock Holmes' Smarter Brother (1975), and Silver Blaze (1977). He featured in three of the St Trinian's movies, starting as an army major in Blue Murder at St Trinian's. He later appeared as Butters, assistant to Education Ministry senior civil servant Culpepper-Brown (Eric Barker) in The Pure Hell of St Trinian's and played the part of Culpepper-Brown in The Wildcats of St Trin...