Tried watching one of his videos once, many moons ago, but couldn't understand half of what he was saying and gave up after a few minutes. I put on a Jimmy Jones video instead, which I found far more enjoyable. He wasn't exactly PC either, but at least I could understand what he was saying, so I 'got' his gags.
I agree with the OP regarding Derek & Clive, I still enjoy watching them now and then.
I guess we can't understand you lot and you lot can't understand us.
Chubby Brown speaks 'properly' though. His accent isn't quite as flat as ours. I think he's cleaned his accent up a bit so that the audience can understand him. Like another poster has said, he's sort of well spoken for a North East fella.