All that really matters is I have two beautiful kids, and I'm trying to be the best dad I can possibly be, and that's the most important thing of all.

And of course I've got kids of my own now, and they love me being in the Harry Potter films. I'm now part of a phenomenon. You become incredibly cool to your kids, and you get a young fan base. So you became the cool dad at school. You're suddenly hip.

A dramatic thing, the first time you stand up to your dad.

And my dad drilled it in my head, you know, 'If you want it bad enough, and you're willing to make the sacrifices, you can do it. But first you have to believe in yourself.

And I saw the sax line-up that he had behind him and I thought, I'm going to learn the saxophone. When I grow up, I'm going to play in his band. So I sort of persuaded my dad to get me a kind of a plastic saxophone on the hire purchase plan.

'Nil By Mouth' was a bit autobiographical, but as I always pointed out at the time, that's not my dad.

Also for me it was different because I play a lot of villains and in this one I play a dad and I play a good guy, basically. He's the Secretary of the Treasury. I never had a job like that.

And I love Mel Brooks. My Dad loved his movies, too, they're awesome, the kind of thing that if you're in for ten minutes, you're in for two hours.

Dad, Dad, ad, Dad, Dqad, Dwad, Dsad, Dzad, Dqd, Dwd, Dsd, Dzd, Daqd, Dawd, Dasd, Dazd, Dasd, Daed, Dafd, Daxd, Dacd, Das, Dae, Daf, Dax, Dac, Dads, Dade, Dadf, Dadx, Dadc.

Although my dad was a doctor, we weren't necessarily a super-artsy family. We were just a classic, traditional family who got to take a lot of piano lessons and became a bunch of musicians.

Although my dad Harry is the manager of West Ham, we get on very well.

A lot of times I would go into a room and audition for whatever sitcom it was and they would expect me to do sort of what my dad was doing and I am not him so they would be disappointed and I would feel nervous and not know exactly how to do it.

And my dad wanted me to play the trumpet because that's what he liked. His idol was Louis Armstrong. My dad thought my teeth came together in a way that was perfect for playing the trumpet.

A lot of young filmmakers bring their movies to my dad because he always gives lots of good editing ideas and notes. He'd be a good film professor.

Although becoming a singer was my plan A after first hearing Whitney Houston when I was 17, I started off with plan B by going to the teacher-training college that my dad went to. It was a slow coming of age.

And in that time, I lost my dad and had kids of my own. It was like, OK, I get it now. I know what fatherhood is all about. And you look at your parents differently.

Also, to be honest, my dad wanted me to be an athlete. And I think all sons want to prove something to their dad. So now, aged 35, I want to see what I can achieve physically.

A mustache really defines your face. My dad had a mustache when I was growing up, and I can still remember when he shaved it, he looked like a completely different person.