Thanks Dave
Uncharacteristic vibration is what set me down the track with the dealership. Replaced front wheel and had two new front tyres fitted. Did not solve the problem. Second diagnostic showed both rear wheels buckled. Rang dealer that I purchased from and they have said they will do nothing to cover costs. Got a copy of PDI report which records "damage to all 4 alloys" but told this was just cosmetic. Raised complaint to BMW Head Office - lets see where it goes.
Just wondering if this was a common fault on that specific design?