Acting

—		Bookish (6 episodes) as Gabriel Book
—		Moonflower Murders (1 episode) as Parris / Berlin

2024

(1 episode) as Isaac Newton

2023

(3 episodes) as Larry Grayson

2022

(1 episode) as Sherlock Holmes

2021

(1 episode) as Mark

2020

(3 episodes) as Frank Renfield

2019

(2 episodes) as Mr. Harmony

2017		Gunpowder (3 episodes) as Sir Robert Cecil
2017		Taboo (1 episode) as Prince Regent

2015		London Spy (1 episode) as Rich
2015		Thunderbirds Are Go! (1 episode) as Dr. Quentin Questa (voice)
2015		Wolf Hall (4 episodes) as Stephen Gardiner

2014		Mapp and Lucia (3 episodes) as Major Benjamin 'Benjy' Flint
2014		Doctor Who Extra (1 episode) as Self
2014		The Real History of Science Fiction (4 episodes) as Himself - Narrator (voice)
2014		Inside No. 9 (1 episode) as Callum

2013

(5 episodes) as Himself

2011		Game of Thrones (4 episodes) as Tycho Nestoris
2011		The Crimson Petal and the White (4 episodes) as Henry Rackham Junior

2010		Mid Morning Matters with Alan Partridge (1 episode)
2010		A History of Horror (3 episodes) as Self - Presenter
2010		Sherlock (1 episode) as Self / Mycroft Holmes (1 episode) as Self (12 episodes) as Mycroft Holmes

2009		Doctor Who Greatest Moments (3 episodes) as Himself
2009		Psychoville (1 episode)
2009		Horrible Histories (9 episodes)
2009		Being Human (2 episodes)

2008		Crooked House (3 episodes)
2008		Clone (6 episodes) as Colonel Black
2008		Only Connect (1 episode) as Self - Contestant
2008		Sense and Sensibility (3 episodes) as John Dashwood

2007		Jekyll (6 episodes) as Robert Louis Stevenson
2007		Derren Brown: Trick or Treat (1 episode) as Himself

2005		Funland (4 episodes)
2005		Doctor Who Confidential (13 episodes) as Narrator (3 episodes)
2005		Doctor Who (1 episode) as The Captain (1 episode) as Richard Lazarus (2 episodes) as Gantok

2004		Agatha Christie's Marple (1 episode) as Ronald Hawes
2004		Who Do You Think You Are? (1 episode) as Self
2004		Catterick (1 episode) as Peter
2004		Nighty Night (12 episodes) as Glenn Bulb (1 episode)

2003		Little Britain (1 episode)
2003		QI (1 episode) as Self

2001		Dr. Terrible's House of Horrible (1 episode) as Hang Man Chang
2001		Friday Night with Jonathan Ross (1 episode) as Self

2000

(1 episode)

1999		Spaced (1 episode) as Agent
1999		The League of Gentlemen (18 episodes)

1998		In the Red (3 episodes) as Junior Detective
1998		This Morning with Richard Not Judy (18 episodes)

1997

(1 episode) as Rev Giles Shawcross

1994

(3 episodes) as Bowmer

1993

(1 episode) as Diner Manager

1989

(1 episode) as Leonard Boynton

Writing

—

(6 episodes) … Writer

2020

(3 episodes) … Writer

2017

(8 episodes) … Writer

2010		A History of Horror (3 episodes) … Writer
2010		Sherlock (8 episodes) … Writer

2008

(3 episodes) … Writer

2005

(9 episodes) … Writer

2000

(1 episode) … Writer

1999

(19 episodes) … Writer

1989

(3 episodes) … Screenplay

1963

(1 episode) … Writer

Creator

—

… Creator

2020

… Creator

2010

… Creator

2008

… Creator

1999

… Creator

Production

2020

(3 episodes) … Executive Producer

2010

(12 episodes) … Executive Producer

Directing

2017

(8 episodes) … Director

1971

(1 episode) … Director