I did the Prescott Hillclimb School day several years ago when I had my Caterham, and a good day it was too.
At the time the course was run by the great Roy Lane, sadly no longer with us, and consisted of classroom instruction, a walk up the hill with instruction on lines, clipping points etc, then individual runs which were video'd and replayed over lunch with commentary and sometimes uncompromising critique from Mr Lane. More runs followed during the afternoon, similar format with commentary and mickey-taking over tea.
Prescott is owned by the Bugatti Owners' Club, and there will be insurance issues preventing just anybody having a hooray up the hill. Book yourself a place on a School day, it's very enjoyable and you get to know the hill and its' many traps for the unwary.