Hi Pete
As Carl said you need to check the injectors with the amp clamp. One of the wires to the injectors should have system voltage permanently (Ign./on) and the other is a switched earth controlled by the ecu.
If the switching is not taking place i would scope the crank and cam sensors next as they provide the position reference information to the ecu to determine the point of injection.
I have come across too many different faults with these cars to supply a silver bullet I'm afraid, so it's down to methodical testing to get to the bottom of it.Good luck
Allan