I recently purcahse an 07 Audi A3 SE which has 2 weeks old MOT as well. Everything is good apart from one little niggle. There is a slight vibration (I do mean slight but noticeable) between 60-70 MPH. There isn't anything @ 80. One thing is though that rear tyres have only got about 3MM of tread left.
Could it be bcause of that or balancing or the bushes ? Any ideas ?