I am a very big fan of Citizen Smith - I first saw the series briefly in 1992-93 on BBC 1 before seeing almost all the episodes (apart from Series 4) on UK Gold in 1993. I think Citizen Smith is much funnier than Only Fools and Horses and it is excellent how John Sullivan's writing in my opinion came to a peak so early on.
I was always very angry that UK Gold didn't show Series 4 in the 90s. I didn't see the last series until 2003 and I think Series 4 is the best - there is much more drama and the series has quite a different feel (a new-look pub, Ronnie Lynch instead of Harry Fenning (Ronnie was rumoured to have had Harry bumped off!), new titles and quite different plots with the TPF having been released from prison.
Shirley's mum Florence is a classic character and some of her lines are fantastic, like when she held the gun to Harry Fenning and his minders, saying "It's not loaded but I know how to use it"!
I think Citizen Smith is is need of a proper BBC DVD release - never mind all that Playback rubbish with Beatles music edited out, etc, etc. The Playback DVDs also have the pilot before the first episode rather than a special feature - the pilot is almost identical to Series 1 Episode 1 apart from having cheaper sets, one or two dialogue differences, a Welsh actor playing Shirley's dad and their name being Jones instead of Johnson.