Television
* The Crown (2016-2020) as Prince Philip, Duke of Edinburgh
* The Last Kingdom (2015-2022) as King Edward
* Red Dwarf (1988-present) as the voice of the ship's computer
* The Bill (1984-2010) as various characters
* Doctors (2000-present) as various characters
* Casualty (1986-present) as various characters
* EastEnders (1985-present) as various characters
Movies
* The King's Speech (2010) as Lord Chamberlain
* The Iron Lady (2011) as John Major
* The World's End (2013) as the Pub Landlord
* The Imitation Game (2014) as Commander Denniston
* Allied (2016) as French Resistance Leader
* Dunkirk (2017) as Royal Navy Officer
* The Favourite (2018) as Lord Godolphin
* 1917 (2019) as General Erinmore
This is not an exhaustive list, but it includes some of his most prominent roles. He has also appeared in numerous other television shows and films throughout his career.