So, here is an unusual one... Sitting on the M25 at 7:30 last night after doing nearly 2hrs of the stop, drive 5 yards, stop routine that now seems to be so popular on the London orbital. Put my foot down and no response - felt like the turbo had packed up. The usual 2500 rpm rush was gone but it rev'd up to 4000. Went on another few miles in heavy traffic. Then I can't get it to rev past 2000rpm, then 1500. Limped my way past the M1 turnoff when the road cleared. So, I tried to build speed with what revs I had to get to a service area. After a few minutes of being honked and flashed, the engine suddently starts responding again and perks back into life. Has been fine since. No temp warning lights - though they seem to light on the ignition pre-check. I'm thinking it must be overheating ? Wondering whether the ECU would be able to switch off the turbo in these circumstances... Deag