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I've had the battery disconnected many times on my 2006 GV and it's never needed a code to work after reconnection. Maybe if you could get hold of a 2006 radio from a scrapyard, fitting it would save a problem. Personally, I've found these radio-codes an irritating nuisance. But calling the local dealer has always come up trumps for other makes, eg. Jaguar.
Leedsman.