Rowan & Martin's Laugh In - Lilly Tomlin, in her best voice, on the phone - "Is this the person to whom I am speaking?"
Not as far back as some of these comedies but I really liked "Lead Balloon" with Jack Dee. Even more recently "Bad Move", again with Jack Dee, Kerry Godliman co-starring.
It makes me realise how many really funny comedies there have been over the years. I don't find so many comedies funny now. Some of them are, in my opinion, very crude, which I could probably overlook if they were funny but many of them aren't. I did, though, love Fleabag and Alma's Not Normal (which could be very racy at times). My favourite is Motherland - and over Christmas my granddaughter and I watched all the series of Outnumbered, which at the time it was being shown, I didn't particularly like as I thought the kids were unbelievably insufferable. I enjoyed it this time round though.