How healthy are you?

I've had a bit of a sore shoulder recently: I couldn't get my head off the pillow so I decided it was a blood clot working its way up to my brain. I'm prone to a bit of dramatisation, especially if it'll get a laugh or I might get a present.

Do you worry about your weight?

When it was mooted that we might do Jonathan Creek again I stood on the scales and I was 13st - the heaviest I've ever been. Out of vanity I tried to lose weight. I've lost a stone, so he's not what you'd call Lean Creek, but he's not as fat as he would have been.

How much sleep do you need?

I'm not a good sleeper; I can get to sleep if I read, which is a shame because I like reading but it has an almost narcoleptic effect on me.

What's your attitude to smoking?

I've stopped. Hoorah! If you can't smoke in the pub what's the point? I started smoking at 11 because I thought it was cool, then I discovered a cigarette machine outside the tube station at Loughton - even schoolboys could buy fags. We're all lucky to be alive.

What about drugs?

I used to like a puff on the weed, but I'm not into any class A drugs. I enjoyed E, but I only ever tried it a few times. There were two or three really funny comedians who messed themselves up by getting a coke habit. One of my great comedy heroes - John Belushi - died after chronic cocaine abuse, so I'm a bit anti-class A.

Is sex important to you?
In a marriage it's important to be content in your sex life.

Have you ever had therapy?

I had therapy on and off for eight years from when I was 29. It's fascinating how childhood traumas can affect you later in life, and why you get into destructive patterns of behaviour.

NHS or private?

I'm NHS, but I often get sent for medicals for insurance purposes. The last thing I had done privately was a cholesterol test. I had quite high cholesterol so the doctor said, 'You've got to stop eating sausages.' I haven't had a sausage since 1986, and I've stopped eating dairy and eggs.

· QI The C Series is out now on DVD