Andy used the 'You know' phrase 8 times in his answer to 1 question. It appears Andy is using it to accentuate a point, to trky to get his listener to understand what he is trying to convey without having to use a large number of words.
In fairness to Andy, I don't think he's alone. If you listen to a lot of young people's conversations they're peppered with "you know", and a lot of older people (myself included) use it too, although to a much lesser extent. It's a meaningless phrase which seems to have crept into the English language. Interestingly, Andy's perfectly capable of excluding it when giving live TV interviews. Maybe he just has problems with jouralists?
