Thought I'd update for anybody who's interested. After several months and umpteen visits to the dealer(who has been brilliant,) I'm at a point where I'm about to reject the car.
So far its had a new mechatronic fiited the gearbox oil pump bearing replaced and then this week a new gearbox including new electronic dif and a new flywheel.
Unfortunately the noise is still there.
Has anyone else ever rejected a car and how did they get on? I've spoke to the dealer, vw uk and vw finance and they all seem to be in agreement that's I've given them enough chances to fix it but well see when it actually comes to the crunch.