Hi, just a general query regarding my saph (which i almost forgot I owned

). Last year it went for an MOT but I had a carry on with the emissions being all over the place and it wouldn't boost more than about 12 psi, is it possible the two could be related?
Going to dig it out from storage tomorrow and start taking it to bits to FINALLY get it back on the road, hence why I've actually put up a technical type question/thread for the first time in ages!
Background info-Engine is new, crank/CTS etc sensors are all new apart from lambda probe.
Had the boost issue since it was put back together about 3 years ago

and eliminated the obvious things like hoses etc, it has a new 500 cooler that may have a fault, but other than that no obvious symptoms of a leak, I do plan to whip it off and get it pressure tested since that is the obvious and basically only remaining thing to check. (Actuator is fine BTW, been swapped for two others).
Thoughts please?