My remote key (single button type) has worn to the point that the button keeps coming away. The removable cover part is ok, its the part that seems to be fixed to the key blade that needs replacing
I have a second key which is in mint condition and would like to transfer the case to my key.
Alternatively, could I get this key reprogrammed to suit my car or will it only fit the ignition lock of the car it came from.
Does anyone know if this can be done or has done it themselves?

you should be able to transfer it keith as long as its the same fob type my mk1 key has the same problem they split around the button. The fix to it is to stop lifting the tailgate up with the key

Bit late i know but as they say better late than never