There's something wonderful about that sort of Poirot, Agatha Christie-style investigation: cross-questioning all the witnesses and checking their stories, looking for means, motive, and opportunity.

I've been going bald since I was about 17. I'm still hanging on to my hair for dear life, but I do sometimes wonder - should I get a wig?

I'm always a bit wary when people say in interviews, 'I'm at the happiest place of my life that I've ever been.' I think, 'Really? Are you?' Life is a mix, isn't it?

As a committed Whovian, I cannot believe my luck in joining the Twelfth Doctor for one of his inaugural adventures. My only worry is that they'll make me leave the set when I'm not filming.

I'm not afraid to say it - I'm proud to be from a nation that wears its heart on its sleeve and isn't scared to show its feelings.