A Webley Revolver was a type of pistol.
Torchwood Three had at least one Webley which belonged to Jack Harkness.
Jack drew his old Webley when facing Weevils. (PROSE: Slow Decay) He also used it to shoot a Nostrovite at Gwen Cooper's wedding (TV: Something Borrowed) and to shoot Suzie Costello. (TV: They Keep Killing Suzie) Jack also used it to shoot Aaron Copley after they shot Owen Harper. (TV: Reset) He later threatened Rhys Williams with the gun but holstered it when he realised Gwen's memory of Rhys had been erased. (TV: Adam) On one occasion, Jack himself was killed by his own Webley revolver, with Owen Harper shooting him in the head with it. (TV: End of Days) Jack also shot a Blowfish in the head using the Webley. (TV: Kiss Kiss, Bang Bang)
Jack also took his Webley with him when pursing the Doctor, all the way to the year 100 trillion where he aimed it at a group of the Futurekind only for the Doctor to shout him down, causing Jack to fire the gun into the air instead. (TV: Utopia) Jack later shot a Supreme Dalek with the gun although it failed to damage the casing, the bullet merely bouncing off. (TV: Journey's End)