My A3 does have Bi-Xenon headlights. Certainly last June my Audi dealer sorted my lights for European Driving by connecting it up to their VAG5051 computer system. When they had done it, a reminder came up on the DIS display to have them changed back when I came home, which obvious I did with a further journey to the dealer.
Perhaps now I will be able to do whilst sitting in my car on the Shuttle train going through the Tunnel between England and France. I will, of course, try it well beforehand to make sure it works OK.
Thanks a lot for all your help.