Ok, I've got:

Frasier (from Cheers)
I'm Alan Partridge (from the day today which is not strictly a sitcom but I'll allow it)
Daria (from Beavis and Butthead. Beavis and Butthead IS a sitcom, however, Daria isn't that Good. I'll still allow it)
Um... First of the summer wine???!

Any more?

I've considered (and rejected)

Pork Pie
Going Straight
Swiss Tony
The green, green grass
Joey
Mork and Mindie
Joanie Loves Chachi
Saved by the bell: the new class.