I'll bring along a VCDS (CAN bus) cable and laptop. £10 for anyone that wants anything tweaked. I'd recommend you lookup the required codes first, in case there isn't a good data connection at the event.
I also used the Superchips Bluefin to remap my A6 Avant 3.0 BiTDi. Worked seamlessly and I can swap the map back to stock at anytime it needs to go back to the dealer. Very pleased with it and now have 374bhp and 789nm torque!! Highly recommend it :-)