Thanks for that Karkek. I'll hopefully give that a try this afternoon.
I've been changing the upper engine loom today so that I can have peace of mind that it's not a wiring issue in that.
Correct me if I'm wrong but providing the SOV is working (which it is) and the rack sensor is moving smoothly (which it is) and the fuel control Solenoid is OK as well as the ECU I should be able to start and idle the car?? I'm also disconnecting the TPS just to rule out any problems there.

Would any of the sensors need to be connected in order to get an idle?? I'm thinking RPM sensor perhaps??

My next step is to try to rule out everything else before chasing back from the IP to the ECU.