I just got the wife's car MOT'd today and this oil leak was pointed out to me by the tester, not VW as they had not any slots left. There seemed to be fresh oil above the drive shaft and he said around the turbo. Car has 10 days warranty left on it, so got it booked in on Tuesday for them to have a look at.
Had a look under the bonnet and there seems to be some oly crud around the air intake downpipe at the back of the engine, as others have mentioned.
Will go armed with this thread so hopefully get it sorted.