Sorry to necro, but I came in here looking for some new names, and will drop off a few that I didn't see listed:
Arj Barker - Slightly deranged and irreverent, his 'character' and delivery make it.
"So I found a grey hair in my beard the other day, and I thought this can only mean one of two things... Either one, I'm getting old... *makes a face*, or two... *conspiratorial whispering* I'm becoming a wizard!
Jimmy Carr - Incredibly offensive but so damn clever, amazing one liners, high brow low brow humour. Not for the faint of heart but if you take it all in good nature just hilarious.
Michael Mcintyre - Domestic slice of life stuff with a very over the top style. Brilliant.