I'm using a pscan tool to read the codes. Interesting that it lists P1300 differently to RAVE, but that's irrelevant really as it still doesn't help give any direction!
For now, reverting back to completely standard (bearing in mind all we're dealing with is porting/VVC manifold) is out of the picture - it's just too much work while still needing the car as a daily 5+ days of the week.
Interestingly one of the mechanics commented when it was in for MOT (which it passed by the way with flying colours on the emissions!) that at idle it sounded/felt like a fuel delivery issue, so I'll definitely be looking to explore that when I get chance - I know you've mentioned it before Simon, I just haven't yet had chance.
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