So an update..
Checked all clamps and hose connectors - all fine and tight, no sign of oil or anything.
Disconnected the VNT actuator bar, and it was easily moved.
Ran measurement block 11 on the vcds to check the movement, all seemed fine, but i did notice that during the cycle the actuator move to max then slowly returned (not holding the vacuum) but this may be normal..
Used my vacuum gauge and the movement is as normal, diaphragm is OK no leaks.
So bypassed the PSV as Chris suggested, still really slow to build boost still lots of smoke. if you wait long enough (nearly 4500 rpm) it will get to nearly 2 baar, but this is a long long way away from normal performance.
Had a spare MAF and 4 bar MAP, installed these but no change.
faulty n75 solenoid
regards
Andrew
PS. did not go ahead with the Mr Muscle