Glenister made his first television appearance in the sitcom Sink or Swim in 1980. He has also appeared in shows such as Soldier Soldier, Doctor Who (in the serial The Caves of Androzani, opposite his Sink or Swim co-star Peter Davison), Only Fools and Horses (as Myles the millionaire garden centre owner and chairman of the SWANS committee), A Touch of Frost and Hustle as Ash Morgan, as well as several films. He is probably best known for his starring role in the BBC drama Hustle; Ash Morgan is a high-level con-man who has to convincingly play various roles or characters in order to pull off a con and lure a 'mark'. He is the only actor who has appeared in every episode of the series. He has also had regular starring roles in the BBC dramas via goodreads