No warning lights. The car has done 80k, but the problem has been there at varying times since around 45k. Driving back from Chester this afternoon it started, had to push pedal to floor to drop the gears and increase revs. No acceleration response otherwise. It feels light you are applying the brakes lightly, then you feel the power come back and it will fail again shortly. As I said after about 5 miles it returns to normal and that period can be 200k or sometimes less.
Interestingly, I was returning from Sheffield yesterday having gone there with no issues and about half way back it started to shudder at about 65mph. I could not get out of it and had no acceleration at all, in fact every bank I came to the speed just slowed and at one point I dropped to 30mph and could do niothing. I managed to make home, by gaining speed on the flat very slowly but had no effect on the acceleration pedal at all, you could put it to the floor. When this started after a while a warning note appeared to check engine and the engine yellow light stayed on the dash all the way. I will take it in tomorrow.