Got the car back from the dealers yesterday, charged me another £389......
I thought I'd check the oil level today when I finished work, they'd given it back to me with it well under the min level on teh dipstick.
Then pulled out of work and the car went into limp mode stuck at 50mph on the way home, plugged my vcds in to find this fault.
000564 - Boost Pressure Regulation: Limit Exceeded (Overboost Condition)
P0234 - 001 - Upper Limit Exceeded
I wiped the fault off accidentally, and the car is now back to normal again