Detectorists and the Royale Family are absolutely brilliant on the more modern comedy front.
I loved The Two Ronnies back in the day, but find some of it a bit ponderous now. Never did like Corbett's bit where he sits in the chair and waffles his way round a very naff Christmas Cracker gag.
My poor brother was called Timothy, and had to put up with years of us doing, 'language, Timothy' at him.
Comedy is such a subjective thing. I agree with a pp that some of the appeal of the old comedies lies in our nostalgia of where we were when we watched them. There's a lot of stuff from that period that hasn't stood the test of time, not just because of changed attitudes but because comedy is an ever-evolving formula. At the time of the 1982 Two Ronnies Xmas special, stand-up comics like Jasper Carrot (a favourite of mine), etc, were considered 'alternative' because they weren't doing mother in law gags or doing the 'Straight/Funny Man' double act a la Little and Large/Cannon and Ball.
Then we had the rise of the comedy sketch shows - Lenny Henry, Victoria Wood, Alas Smith and Jones, leading on to Goodness Gracious Me, the Fast Show, The Catherine Tate show. You don't see those types of shows any more. I loved them.
Sitcoms are an ever-changing beast. Somebody mentioned Ever Decreasing Circles up thread, which I loved watching at the time, but I read something about why they stopped making it and the truth was that people just fell out of love with the suburban middle class style, just as they fell out of love with the sketch show format.
I remember them all fondly, but they, like most comedy, were of their time in format and content. I don't wish we made them now, but I do enjoy seeing them again.