I had one of them moments where your best friend is in his car and there happens to be a set of traffic lights on red and an empty road. When I set off( and it has done it ever time since I bought it) it drops the revs all the way down then accelerates again. Is this a problem with the car or is it like this on all of them? Just a bit embarrassing when I didn't pull away from his 1.6T fiesta st as quick as I thought I would. If it is like this on all of them how do I stop it doing this?

Might be worth checking your MAF, I had a similar problem which was fixed by cleaning my veryyy dirty MAF :). Hope it helps

Cheers will look at it