Martin Compston is a Scottish actor. He debuted in the 2002 film Sweet Sixteen. After this, he starred as Ewan Brodie in the British drama Monarch of the Glen. He later had performances in the films Niceland (Population. 1.000.002), Tickets, Wild Country, A Guide to Recognizing Your Saints, Red Road, True North, Doomsday, The Damned United, and The Disappearance of Alice Creed. He gained wider recognition for his role as Detective Sergeant Steve Arnott in the TV series Line of Duty, which he has been playing since 2012. He has also appeared in the films Filth, The Wee Man, The Hunter’s Prayer, and The Aftermath.