You've mentioned some all time classics, from when comedy was allowed to be funny and snowflakes didn't exist.
Another from the 70s is Fawlty Towers, it only ran for two series but that didn't stop it from being one of the all time classic British sit coms.
Bottom was absolutely hilarious, I still watch it and wish I'd been lucky enough to see it live on stage.
However, every one of those mentioned pale into insignificance compared to the hilarious and brilliantly written Only Fools and Horses, probably the best sit com in the history of comedy.