Matt Smith and David Tennant refuse to be drawn on Doctor Who, Emma Thompson says she will never have cosmetic surgery, Robbie Williams reveals he was homesick for England and Jimmy Carr talks about performing for royalty.

Emma Thompson, talking about Doctor Who denies speculation that she was offered the role, "I would have said yes, I'd have loved to have played Doctor Who. Maybe women need their own kind of new time travelling person?"

Talking about her recent experience on the Hollywood Walk of Fame, she says, "It's weird, they ask you to dress up and then present you with a square yard of wet cement and invite you to put various body parts in it. Don't you think that's eccentric?" And on taking her well publicised tumble, she says, "I was doing a pratfall, I was mucking about as usual and because the press suck any iota of joy, humour or hope out of those moments, they said I had fallen over." Deliberately falling off the sofa, she says, "I can't help it!"

Of P L Travers, the creator of Mary Poppins, who she plays in her new movie, Emma says, "She was vile and a fascinating character to play. She was a powerful biddy who turned up in Hollywood in good shoes." Reminded that there are parallels with her own life as the creator of the magical Nanny McPhee, Emma, joking says, "My husband said, 'I wonder if behind every magical nanny there is a rancid, bitter, cantankerous old bat?"

Asked if she's had cosmetic surgery she says, "Look at me, I'm normal. I really wouldn't do anything. It's psychotic to have your body opened up and stuff put in and injecting yourself with poisons."

On working in Hollywood she says, "I like LA because I've got really good friends there, but it's a funny old place. It's a strange place and as soon as you get there you think, 'Oh my god, my bum looks big in this,' meaning LA. There's also a real hierarchy. I don't like that. They will always find a way to make you feel bad."

Robbie Williams, talking about his own experience of LA, says, "I've lived in LA for a long time and they say, 'If you sit in a barber's shop for long enough you will get a hair cut.' Well, if you live in Los Angeles for long enough you're going to get some surgery. I've had a thatch done and I didn't even need it. That's the weirdest thing. I had three months off and got bored."

Revealing the reason for his return to the UK, Robbie says, "Teddy [his daughter] was born 13 month ago and all of a sudden I got homesick. I want her to have British sensibilities and for her to understand irony."

On writing certain songs for her, he says, "I've been very selfish in the past and have had everything done for me so I was terrified I wasn't up to looking after this little person so Go Gentle sealed my promise to her that I would."

Talking about his rekindled love of touring he says, "It's really cool. I spent three years away not doing anything and it took me two years to get back to a place where I felt confident enough to do my job and I got all this acceptance and love and now I am addicted to touring, to the shows."

Jimmy Carr, talking about his famously rude stand-up routine and his upcoming performance at the Royal Variety Show, says, "My show is about two hours long and I've got to do six minutes on the Royal Variety. There was a long telephone conversation with them saying, 'You can't say that,' 'You obviously can't say that,' and, 'That's the worse thing in the world.' Eventually we found a few jokes I can do. Prince Charles can take a joke I think."

Doctors Matt Smith and David Tennant pop in for a chat about the upcoming 50th Anniversary Doctor Who special. Reluctant to give anything away about the storyline, Matt reveals that Peter Capaldi, the new Doctor, will not be in it, "Peter joins at Christmas."

Sporting very long plaited hair for his upcoming theatre role, David says didn't need persuading to appear in the show, "There is a bit of a precedent. Down the years some of the old doctors have returned and shaken hands with the current one."

Asked if it was weird both of them being in the show, David says, "It could have been weird and I think people expected us to be feuding. It was quite odd but it ended up being good fun." Matt adds, "Whenever I saw David I thought, 'Wow, that's Doctor Who. It's great for the show because having the character meet himself gives lots of scope for silliness."

Revealing there were certain etiquettes to be observed on set, Matt says, "There was a bit of that particularly in my Tardis. I asked David if he would like to fly it. You want to be gracious." David, feigning jealousy when sonic screwdrivers are mentioned, says, "His is bigger than mine and it has a bit that comes out of the end and lights up."

Graham pulls the lever on foolhardy fans of Doctor Who brave enough to sit in the Red Chair and ask questions of the Doctors.

Robbie closes the show with a live performance I Wanna Be Like You with Olly Murs.