An update - have replaced Cam Synchroniser and sensor, coil packs,
IAC and TPS. Idle hunt is still there, however the car is running heaps better.
I will do leads and plugs next. However I am suss on the alternator/regulator. Sometimes the instruments voltmeter sits at 14v, other times just under 13v, or anywhere in between (this is with no A/C or lights). I might run some leads and monitor with a DMM, I don't really trust the cluster at the moment.
And as a curveball a tapping or knocking noise has now appeared, I've got it on video and will start another thread.