Help needed - 90's Comedy

I would love it if somebody might be able to help me :).

There is a TV show, sitcom comedy from the UK, from the 90's, that I can remember watching growing up, that I have forgotten the name of.

There is a male lead who I assume had some part in writing and possibly producing the show, who plays a load of different characters in the show. The most popular one is that of a grumpy, frustrated teenager. It's a man in his 30's/40's, but he's playing a teenager, and he has a red Nick Carter in the 90's type hairdo, drawn on freckles, and colourful youthful clothing. He does a lot of huffing and puffing, throwing tantrums about pretty much everything, and he seems to be very obsessed with sex, and the lack of it in his life. I can remember one bit where he uses a vacuum cleaner and fakes a hickey.

He also has a character where he plays a baby and wears a diaper. There is a woman who plays a lot of different roles along with this man. She will play his baby sister, and I believe she has played his wife as well. There is one scene where he is playing a baby, and he is in a oversized crib, and his sister is in the other end of the room, also in a crib, and I believe a popular super model of the 90's plays a part in the scene somehow. I don't remember who the super model is.

Does this ring a bell for anybody? It's a very popular character, I just honestly can't remember the name at all, of either the character or the actor. I've tried googling, but I haven't come up with anything.

Get off the couch and give me a scale!