Kate Smurthwaite is one of the worst I've seen. Her political material makes The Mash Report seem edgy.
I'd never heard of her until she was on Couples Come Dine With Me with her boyfriend/lackey, and she bored the other contestants to tears going on about her glittering career as a standup and commentator which he apparently manages (i.e. takes her phonecalls and does all the cooking.) She even had the brassneck to suggest to the other contestants that they might recognise her (one gallantly said he thought he might but the others cheerfully shook their heads.)
Anyway as their entertainment her and Smithers performed this excruciating ''comedy'' dance dressed as ancient Egyptians, which she proudly declared they'd performed at the Edinburgh festival, and which made the other contestants look as if they'd welcome a swift death. It takes a shocking lack of self-awareness to tell a bunch of strangers you're a comedian, knowing full well the expectations that'll set up, then go on to perform something so completely unfunny. And when the whole thing's being televised. If memory serves she was really superior generally, and particularly about one of the other couples, condescending to admit she was 'pleasantly surprised' that they weren't as awful as she'd decided they must be having judged them entirely by their fake tan and makeup. None of the other contestants seemed to like her much, including her boyfriend.