TV
Rex Features
The actor has decided to pursue new projects after playing the Sheriff of Nottingham on the BBC One drama since its launch in 2006.
Speaking to the South Wales Evening Post, Allen explained: "I doubt I'll go back for a fourth series if they do one - it's boring to work on now. I've done three series, and I'd like to move on to something else."
He added: "The work I've done on it has been brilliant, though. I've enjoyed all three series a huge amount, they've been excellent.
"But there's lots of different aspects to performance, and I want to try different things."
Lead actor Jonas Armstrong has already announced that the current series will be his last.
Though a fourth run has not been ruled out, the BBC has not yet commissioned new episodes of the programme.
Tube Talk
'Freaks and Geeks': Tube Talk GoldTube Talk Gold heads back to the '80s and remembers Freaks and Geeks.
TV Interviews
'Celebrity Apprentice' Debbie Gibson Q&ADebbie Gibson opens up about her Celebrity Apprentice experience.
Reality Bites
Does Simon Cowell have new SuBo?: VideoWatch a clip of Jonathan Antoine, who is tipped for success on BGT.
TV Ratings
Judi Dench draws 4.1m on 'Graham Norton'ITV1 pips BBC One to the highest primetime audience share.
