I've ran an actuator test until I was blue in the face, it never stuck once, I checked the position sensor via live data on the road and found no problems. After an extensive road test no fault re-occurred so I'm giving it back to the owner to try out, the vehicle has only covered 24,000 miles; I'm of the opinion that diesels have now lost one of their primary attractions "reliability"! I'll stick to my motorbike!