FYI last years Silverstone British GT fastest lap was abround 2-dead.
And castle coombe was ~ 1:05 in a Ferrari a few weeks ago.
When you add in the fact that they are racing, with cars setup for each track, stripped and race-prepped, much much much better drivers.
Well I like to compare, as 30 seconds behind a race car on the fastest lap of the British championship rounds is quite close for a battered old datsun. I was even nice while watching the F1 to be more than half the Speed of Pole lap ....
Actually have the exacts ...
Well compare to GT3 fastest laps
Coombe 05
21 GT3 Lester/Simonsen Ferrari 360 1:08.486 3 156.50kph 97.24
And NGT as it was last year
Silverstone 04
35 N-GT Kinch/Kirkaldy Ferrari 360 Modena 1:58.652 1 158.35kph 98.39