Rover 45 Immobiliser problem

Hi

Had the battery off my Rover 45 for a couple of days and now I cant start it. Seems like the immobiliser is still engaged. Have tried using the key code and my key but still wont start. Might have the wrong code- is there any way of finding out what the correct code is or if not can the immobiliser be disarmed?

Hope someone can help!

Pete

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