Be careful with Rover 25 because from 99/00 onwards all 16v non VVC engines used MJY100640 injectors.
Seller just provided info to which engine you can mount injectors he is selling, but not on which cars you will find injectors mounted from factory. So from my point of view you need to look on any cars prior to 1999 to find beige injectors mounted from factory.
Just a note, since RookyMGF have MG F and not MG TF, he has Lucas alarm system and squarish 2 button fobs. He does not have Pektron SCU of later MG TF.
However sorting door lock/s should be done as soon as possible.
As Airportable said if you have Pektron system (oval fob with logo in the middle) BCU unit operates thes two indicator relays and your best call would be to Paul @
https://www.technozen-electronics.co.uk/
since this well might be Pektron BCU problem.
I hope you solved your problem. As I mentioned above same Brown/Pink wire provides power for many engine components. Lambda sensor is one of them. So if you had melted wires which could touch metal body or exhaust and by that ground itself, that would certanly blow your 30 Amps fuse.