321kph in a Bentley GT Speed!

Returning to the start line to add some more air to the tyres and have another go, the Speed reverts to its normal, relaxed, cuddly self again. It's used quite a few litres of fuel in just one run, but the engine temperature hasn't budged, and all the other vital signs are normal. It feels like it could do this all day. And, as physically unruffled as I am by the experience, so do I.