Thank you to the forum for the info that has sorted my woe's following the Turbo shating itself a year ago.

I didn't think this was the cure but for an hours work, a little WD40 and an old tooth brush, the power is back to it's remapped 170bhp with faster pick up through the rev range and much better throttle response.

I wasn't expecting the exhaust smoke, even when gently accelerating to go but it has to be at least 85-90% better than it was.

100% adding both the below how2's to my service plan. For the time it takes will be doing it every 10k.

Still got a rough start up issue so next on the list is the EGR to be cleaned and partly blanked and the Leak Off pipes changed.

Thanks once again, just wish I found this info earlier!