John Simm has described the final scenes of the Doctor Who Christmas special as a ‘brilliant send-off’ for David Tennant.

The Life On Mars actor, who returns as The Doctor’s nemesis, The Master, in the two-part special, says he had ‘such fun’ working on David’s last episodes, which are now complete.

John told BBC Radio 1 Newsbeat: “It’s all done. I’ve just spoken to David and he hasn’t seen it either. We’re doing some dubbing and we go in and do the voice-overs.

“Hopefully we’ll see a bit of it then. I’m looking forward to seeing it. It was a great script and we had such fun doing it.

“It’ll be a brilliant send-off for Mr Tennant. Last time I did it it was such fun to do. It was wonderful to be asked back and to be in the very, very last one.

“To go head-to-head with him was a real honour. It was lovely to be asked. It was a great, great experience. We had such fun doing it. Hopefully it’ll come across.”

John first appeared as The Master in 2007 in a special three-part end to the last series – and he admits taking the role so that eight-year-old son Ryan could see him at work.

He said: “The things I usually do on TV or film are quite adult and he doesn’t get to see it.

“He knew his dad was an actor but I never got the chance to prove it to him because he’s not allowed to watch Life On Mars or Human Traffic or State Of Play. He wouldn’t get it, thank God.

“It was a great opportunity to make my son proud.”