As an update, with some progress. Found out the car had an Immobilier fitted on a start button, the button wired direct to the starter solenoid and battery. Car started every time, vesy easily but could not solve the electrical problems I had, so I decided to remove the Immobilier and put the connections on the ignition barrel back to standard. The good news is that the electrical problems are solved, the bad news is that the car now won’t start using the key, it turns over but won’t fire up, whereas previously you turned the key and pressed the button and it burst into life. I removed the Immobilier and all wiring but could there still be something stopping the car from starting or what else could it be if it now only turns over but previously worked fine?