Update:
Voltage is at coil..re checked this morning... around 70 V Dc same as the left hand side which is going. Must of had my wrong eyes in .....sorry guys.
When the cabinet switch is closed the coil tries to fire, ever so slightly...not enough to move the flipper more than about 2mm from rest. that is the best way I can describe it. I have just ordered the schematics from the US , Also been trying to nut something out via schematics online .....bloody hard bordering on impossible for me. Looks like a little opto ( U8) is the first component in ...maybe . Any clues??