Brilliant thanks for your reply. I've had a look and you can get these parts second hand for like £100-£200... Crazy!
Would you happen to know if there's some coding to the car that would need to be done? Basically thinking about the part that detects your key is in the car for keyless ignition. Thanks for your help!
Alternatively, what about buying a second hand unit and taking the Bluetooth chip out and just replacing that bit...? I'm going to do some searching on that lol
Thanks again