Thanks for the info. I will take a good look at the car when I get it back (its in the garage at the moment having some bits sorted). Can not find any specific wiring diagrams on line for the MG ZR, but like you say unlikely to be fundamentally different than the 25.
The C0286 connector on the K109 header looks a likely place to look as its common to the engine, abs and airbag. I will do the continuity check from the C0913 pin 58 through to C0040 pin 7 as well.
Locating the connector is probably going to be quite a challenge, I am not familiar at all with ZR’s (or car electrics in general to be honest!), but will take on the challenge !!