I nearly forgot, I once saw at a live gig, 'The Bastard Son of Tommy Cooper', while not strictly a comedian, he was very funny.
He comes out wearing only boxer shorts and a fez, and proceeds to do his whole act in rhyming couplets, in the voice of Paul Daniels, for no apparent reason.
His act mainly consists of him maiming himself for laughs, wiring himself up to a massive generator and lighting bulbs with his body, swallowing a 3 foot strip light bulb and switching it on inside himself, and pushing nails up his nose then squeezing them out of his tear ducts and other such pleasures.