So my week-old A3 has developed a rattle As soon as I reach 2100 - 2200 rpm I hit the resonant frequency of something in the lower half of the driver's side door. It sounds like a pen's sitting in the storage compartment but it's completely empty. I've got it booked in at Glasgow Audi for Tuesday morning.
I don't expect anyone to be able to help - just wanted to share my (slight!) misery at having to be parted from it so soon!