Left it in my work carpark, came out, wouldn't start. Spent £80 on a new battery, turns out the problem is most likely the control module in the steering column. Official diagnosis tomorrow afternoon, but assuming it is what I think, I'm looking at about £2k or potentially more to fix it as everything's coded, so it can only be repaired by the main dealer. Not a great introduction to Audi ownership.
The Dodge Caliber with peeling paint and creaking suspension I bought off my gf's family for shed money continues to run perfectly, every cloud....