I Just had a read up Mike, and to be fair I had missed that, however, plugged in to the Snap On OBD computer the temp steadily rises on the live data.
Its all in bits at the moment, as I'm replacing all the vacuum and turbo hoses (they look tired regardless) along with a new PCV (I just washed it in petrol before). All stuff that needs doing anyway. I'm also looking at the operation of the VNT boost control solenoid and the arm - Figuring that if the Synergy is new it could have pushed it past its normal limit and got stuck on crud (Ron at Synergy suggested this in a fault finding guide).
I've replaced the MAF with a genuine new Pierburg - no improvement, in fact it runs a hell of a lot worse, so I need to check the wiring there (again, some suggestions to follow from Ron).
If all that fails to get any results, my next steps are likely to be air temp sensor, fuel pressure sensor, and coolant temp sensor (not in that order - will start with cheapest first).
Ultimately, I see me pulling the injectors and having them tested by a reputable company - and replace if required. Shame, as I got it cheap and its cost me a lot in bits so far!!