Re: magnificent
You could try Old Harry's Game by Andy Hamilton. He's done lots of good stuff on radio and TV.
Also Alexei Sayle's Imaginary Sandwich Bar, and Lenin of the Rovers
Meet David Sedaris is laugh out loud too.
I'm Sorry I Haven't a Clue is good
All from BBC Radio 4
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Red Dwarf, Benny Hill, Fawlty Towers - all individually brilliant and unique. Father Ted very good too.
Porridge, Open All Hours - Ronnie Barker
Early Absolutely Fabulous?
+1 for stuff by Armando Iannucci. Chris Morris fronted The Day Today, is this where Alan Partridge started?
Chris Morris's Brass Eye (his gardener is my gardener :) )