Private site, looks promising - http://www.british-sitcom.co.uk/
which is devoted to "Are you being served?". It would be good if they could get "Yes Minister" (followed by Yes Prime Minister) over there, being the clever and hysterical tongue-in-cheek look at how the corridors of power work. (Imagine Spin City but with rather more British reserve.) The re-runs are on UK Gold here at the moment.
Personally, I like to watch re-runs - not because they are re-runs but because I missed most of them the first time round!
I loved that series, it was so funny seeing him get all tied up in bureaucratese. As I understand it, Jim Hacker and his antics was so realistic, Paul Eddington (the actor who played him) used to get invites to discussions of events with the leader of the Swedish(?)/Norwegian(?) government.
My other particular favourites are To The Manor Born and The Good Life. Basically any comedy which is subtle, and shows class not crass.
Currently on that I know -
As Time Goes By (ok, call me a sentimental sap, but I watch it regularly, even if have seen them all)
Are you being served? (funny show, with plenty of twists on puns)
Keeping Up Appearances. (ok, some parts great laughs)
Last of the Summer Wine. (ok, but not particularly a fan)
Waiting For God (love it, watch it regularly, even if seen most episodes)
Chef! (although it's moved time, not sure if is on currently or not, normally enjoyed)
And in the past when they were on local PBS-
No Job for a Lady (ok)
Good Life (called Good Neighbors in USA)(enjoyed it often)
To the Manor Born (didn't see it a lot)
Red Dwarf (enjoyed it)
Doctor in the House (barely remember it though)
My Hero (ehhhhh)
Fawlty Towers (classic John Cleese)
Vicar of Dibley (some good, some not so good)
Eastenders (but it was more of a soap, don't see on the list)
And not sitcom or soap I guess, but never forget Dr. Who.