I've noticed a few threads pop up on here about some of the acts on Britains Got Talent and thought it might be useful to give you all a link to the website of the channel that make the program, where all the videos are easier to watch altogether. Unfortunately you might have to watch a very short advert before the actual clip comes on but it seems to be faster than youtube and infinitely better quality.
http://www.itv.com/talent
It's updated as soon as the show goes out on a Saturday night (UK time).