you can use a Second hand key fob (swap the key blade over from yours) if you get it with the 13/14 digit bar code, this can then be converted into a set of three fob codes or the donor range rover fob code are known that can then be entered into your Becm (Becm needs to be unlocked for this to be entered) But some 2nd hand keys are at the end of there life.. Swings and roundabouts.