Hi all, quick update as it's been a few days. I'm still without a dongle, have given up on the first one I ordered (over a week ago) and bought from a different supplier today. I would avoid this seller on ebay: cwautodiagnostics - absolutely useless, no tracking information and they don't respond to messages.
In the meantime, I fitted a new MAP on Saturday and took the van for a quick drive. Still the same, turbo not working. Turned round after a few hundred metres and came back. Scanned with my cheapo OBD reader - no codes, but the van hadn't gone into limp mode as I was out for such a short time.
Turbo Electro Valve / Solenoid has arrived today so I will fit that shortly and try another quick test drive for what it's worth.
I've got some Miller's additive ready to go and will be filling up with premium fuel as per Fred's recommendations, once I have enough confidence in the van to get me a few miles to a petrol station that is.
As the ECU has obviously decided to shut off the turbo, will I need to clear / activate something with the
MultiEcuScan to tell it to work again? In it's current state I would struggle to perform the tests required once I have the dongle / software.