Had a look at the car yesterday and found a split in one of the pipes going to the two boost valves on the n/s inner wing, replaced the pipe and thought i had it cured as the management light went out straight away and had full power and boost when i drove off in it.

Not cured completely though as light still comes on but only when you leave it at idle for 5 seconds or more, take off and have lack of power until after about 5 seconds and light goes out and we are back to full power again, until you let it idle again !!!!