Think all the Concert II head units need CANBUS otherwise they switch off after an hour and your A3 is not CANBUS.
Better option would be a Becker GP as it looks stock, uses the same wiring as Audi and will also play mp3 CD's. Failing that you'll need a Concert 1 tape player and a CD changer http://www.sextonsdirect.co.uk/GP7992_becker-grand-prix-7992-cdmp3wma-tuner.html
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