Out of interest where was the oil on the dipstick?
Donington IME is not that power dependant, certainly nothing like Castle Combe. In a 26front drive something like a LSD would have a bigger advantage than 40hp more. Then of course 300hp would be a bit of a handful in the corners (from experience)
Above the min mark after the engine died, granted it had used a bit of oil, it was above half way between min and max before that run

I think that will be due to the driver rather than the car, lets not kid outselves that a Cupra R has higher corner speeds than an Elise or Ferrari.
Quite, but the point he was making was that any driver can nail their car in a straight line, and the extra straight line speed would have helped me more in the situations I was in, as it would have meant that the cars with a higher top end wouldn't have kept re-catching me down the straights, given that I was already driving faster through the bends (down to driver talent/braveness).