well people will use brunters differently depending on whether its an event(vmax) or a mag feature.

You cant assume everyone will have good enough brakes to stop from a top speed run at 1.7miles hence vmax does it at 1.5miles for safety

Suppose you can say, top speed including braking within 2miles as then that covers everyone.....or top speed at brunters, in which you can use the tarmac as you please.

Big concern about having the plane there as im gonna be stuck for distance on my run. Thats why i have been thinking about RAF woodbridge as recommended by Rod.