No, nothing too bad. I was at about 17/18km around the lap, there is a bit that jumps down which I was braking a little for, then it opens out to a short but very fast straightish bit, just before the mini carousel. It's flat out in 4th and maybe 5th and you can take a huge bit of grey rumble strip with the left hand side of the car - I did, at I guess 120mph and the car just died. Absolutely dead, even the speedo stuck on.
I coasted for quite a long way looking for the safest place to stop, which was harder than I imagined. Had to park up and leave the car. Managed to hop back over and check for loose battery terminal, but that was really difficult to see. The tow truck was on the way by now and the two marshals had arrived and coned off the area. Then it stuck me, as the tow truck was in sight, why don't I try pressing the big green button on the dash - with the marshals permission I hopped over and she started straight away. Then they wouldn't let me drive off - then I begged, and they let me - straight to the office to pay my fine........
Pic below of strict marshal, who was then was very pleasant, their very nice Focus and stranded Exige with stunning view.