- Appeared in the 1989 Doctor Who (2005) episode Battlefield: Part One (1989) as an extra, and in the guest role of Elton Pope in the 2006 Doctor Who (2005) episode Love & Monsters (2006).
- He has two roles in common with Christopher Lee: (1) Lee played Count Dracula in ten films from Horror of Dracula (1958) to Dracula and Son (1976) while Warren played him in Dracula (2006) and (2) Lee played the Comte de Rochfort in The Three Musketeers (1973), The Four Musketeers (1974) and The Return of the Musketeers (1989) while Warren played him in The Musketeers (2014).
- He worked with Robert Glenister in Hustle (2004) and his younger brother Philip Glenister in Life on Mars (2006) and Mad Dogs (2011).
- Graduated from East 15 Acting School.
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