The owner of this car reckons that he knows of 5 others with the same fault. Basically, after driving the car for a short distance and parking it up, when you then go to drive off and accelerate hard it will run rough, loose power and will eventually go into limp home if you don't back off the power.

Codes stored are 2510-001 Component Y77/1 Boost pressure regulator positioner signals fault and 2616-002 Component B60 exhaust back pressure control variation - back pressure is too low.

Both faults occur at the same time so I assume that one is a symptom of the other. I suspect that the turbo may be briefly over boosting causing the exhaust back pressure sensor to read out of spec.

Freeze frame data recorded shows -
RPM 2850
Engine Temp 61 deg c
Exhaust back pressure 3570 hpa
Exhaust pre cat temp 1195 deg C
Boost pressure 2576 Kpa

I've carried out a turbo actuator test which it passes.

I'm not sure were to go from here but I'd love to get to the bottom of it as it sounds like quite a common fault!