My memory is hazy but I recall Channel Four in its early days commissioned some interesting sitcoms that never lasted long but were pretty good.
I would like my memory jogged and these ones come to mind:
Chance In A Million - Was this a spoof of a slapstick comedy setting Simon Callow up for silly pratfalls?
Struggle (I think) - Tim Piggot Smith running a loony left London council. Remember it being quite funny if I was older and understood some of the jokes.
Fairly Secret Army - Geoffrey Palmer as a sort of right wing Citizen Smith.
Tandoori Nights - Sayeed Jaffery as a curry house owner. All I can remember of this three decade old Asian sitcom is that it was better and less dated than Citizen Kahn.