hi lads, my intermittent battery light and splutter turned out to be a crank case sensor and squashed breather pipe! still all done and i had a lambda sensor replaced while i was there and got relieved of 400 quid for the trouble. Got quoted 800 at bmw for the same job so it took the sting out of it a little. thanks for the feedback on the complaint i had and if you all manage to get a split second misfire and a battery light on for a flash it will be the crank sensor