They've been mentioned, but not enough - Only Fools & Horses is one of the great classic British comedies, second only to Fawlty Towers in my book. Del's ridiculous scheming, Rodney's gormless look and attempts to strike out on his own, Boycie lording it over them all with his money, Trigger's stupidity, Uncle Albert's "During the war...", etc. One of the funniest shows ever made. It's a product of it's time in that a lot of words and dialogue wouldn't be allowed today, but it's still absolutely hilarious.
Monkey Dust - what can I possibly say about Monkey Dust? There is nothing else like it out there.. anywhere as far as I know. It's an incredibly biting look at Britain and British life as well as pointing fingers at other countries, especially the US, where Hollywood keeps churning out revisionist historical films ("In honour of all the Americans who lost their lives in the Early Middle Ages"). Many would find this show extremely offensive, and even those who love it describe it as sick, but it absolutely is a work of art... and damn funny with it.