Alan Armstrong, known professionally as Alun Armstrong, is an English character actor. He grew up in County Durham in North East England, and first became interested in acting through Shakespeare productions at his grammar school. Since his career began in the early 1970s, he has played, in his words, "the full spectrum of characters from the grotesque to musicals... I always play very colourful characters, often a bit crazy, despotic, psychotic".

New Tricks is a British television police procedural comedy drama, created by Nigel McCrery and Roy Mitchell, produced primarily by Wall to Wall, and broadcast on BBC One. The programme originally began with a pilot episode on 27 March 2003, before a full series was commissioned for 1 April 2004; New Tricks concluded after twelve series on 6 October 2015. The show had an ensemble cast, of which Dennis Waterman was the only constant over all twelve series; the cast variously included Alun Armstrong, James Bolam, Amanda Redman, Denis Lawson, Nicholas Lyndhurst, Tamzin Outhwaite, and Larry Lamb.