Hi Bazza,
If you want to get a spare key, then this is similar to whet I got, as you already have the key blade and the cover all you would need from this is the inside PCB. Then if you want we can get it reprogrammed.
ww.ebay.co.uk/itm/ROVER-75-MGZT-2-BUTTON-REMOTE-KEY-FOB-TESTED-/391254564392?hash=item5b1896de28
Sierraferry, FYI, from this morning, original ( OLD ) keyfob would sync, but would not go the final stage and show detected. New keyfob showed detected and is working for Bazza, ( fingers crossed) .
If you have any ideas for what else could be checked for future reference then please let us know.
Cheers
Neil