Hi I dont want to get anyones hopes up and im sure i wont, but i went into a dealer near me at the weekend and asked about this problem. The guy from servicing said that they are aware of this problem and he is absolutly possitive that there is a way of switching it back and said they have done so on a number of lags. he has given me a card and asked me to call him later today. I will keep you all posted but dont hold your breath.
On another note, im not sure how much ther sell for on
but the little key rings to attach the card to your keys are only £1 from the dealer, and they keep them in stock.