New update, so new post.

Replaced the PCV hoses and valve. So far I've replaced that and the spark plugs, HT leads, coil pack, filters and oil.

After resetting the ECU, things may be shaping up. I think one of the cylinders is so clogged with crap it's not running smoothly straight away. But took it for a run, ok for 30 seconds, then ran crap but it seemed to start clearing up. I had no thumps or rattles reversing into my driveway. It still sounds a bit throaty on a cylinder but could just need clearing out, suggestions for something to clear it faster?