Re-read and realised it now turns over.

The only thing I can think is CPS, as this is the input the ECU uses to send a SPOUT and would register a fault.

Does it smell of fuel/plugs wet? If not then even more reason to suspect CPS, as the pump won’t run without it, also check all four lugs are intact on the crank pulley.

You can easily check this by removing the “hairbrush” cover and measuring the voltage from it whilst cranking, should be in the order of around 2.5V AC.

I repaired someone’s ECU on a 3 door restoration which would not start and it fired up immediately, then died and would not start again, but this was because of lack of fuel.

Martin