I take it you have tried clearing the
17705 - Pressure Drop between Turbo and Throttle Valve
code
and that it comes straight back??
Yes I did. Yesterday when I went out to get those logs the first thing I did was clear any codes. By the time I'd stopped after the first log, it was back. I cleared it again to drive home and it came back again.
I've found out today that my warranty that came with the car covers me to use any garage I like for repairs, so I've thought sod it and have it booked in with JKM in Portsmouth. If it's MAF or a boost leak or both, they should be able to sort it
Thanks for the advice so far, I'll keep you posted with the outcome...