Right, it's all sorted, took it to John at Autogas 2000 and he noticed that a shim had not been replaced when the stepper motor was changed. The motor didn't have the clearance necessary at idle and was grinding itself into the distributor body. 2 motors were knackered in this way. He has replaced the stepper again and replaced the shim and it has worked perfectly ever since.
Can't recommend John and his garage enough I'm genuinely delighted to have the car running back the way it should.
I fnayone is having similar problems it'll be well owrth taking your car for him to have alook. He bent over backwards to sort it out for me in double quick time as well.
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