Ok!

To update - went outside and decided to try the 5 turns clockwise, two counter clockwise thingy with the old chip so I can drive to and from work in the morning

Then, as I looked at the mixture potentiometer, I realised that the (WARNING! TECHNICAL INDUSTRY TERMINOLOGY AHEAD) 'bendy metal thingy' that connects the screw head on the casing to the pot had slipped out of the groove on the pot and it was flailing in the breeze!

No wonder I was getting no change in my CO on the analyser!

So i re-located it. Did the five turns, two turns thing whilst watching to make sure it didn't slip out again and BOOM!

Sorted...for now...I think. Took it for a spin. Got it hot. Gave it a little boost and blew all the shit out the back. Then re-adjusted base idle. Runs like a dream!

Excited to turn the boost up tomorrow on the dyno

Cheers to everyone on Passionford who helped with this case, and from previous posts that led me to this place

Ben