Found out the reason in the end. Realised that the issue had to be vacuum related due to the deviation codes, so went hunting around the vacuum lines. Found a little issue with the one going to the turbo VNT mechanism.

Such an innocent looking piece of rubber (printout behind was used to check all going to the right places. )

But the turn over said bit of rubber! What have we here? Someone has become dislodged and must have been resting on the exhaust downpipe/manifold! Big bloody hole burned in it! A quick shortening and reattaching and it's back again! Full boost.

Nice one Jason

I thought that limp mode only lasted that long when you get old?

Good bit of detective work there mate!

Bas

It normally is something little like that which gets you irate because its so minimal.

Bet your glad its sorted though

Always nice when a story has a happy ending...

Good stuff Jason.