Interesting, I was there competing there in my stock-ish Mk3 MX-5, considerably slower still (obviously) and didn't even notice there was a M3P there/on the entry list
I'd imagine it'd do even better at a hillclimb like Wiscombe where that acceleration is even more important than at Castle Combe
Combe is wide and not very technical perfect for an EV, just about power, Wis is tighter and technical, the Tesla is too much of a tank, doubt it'd do that well, but 4wd EV traction could claw back more than I'd think, it'd probably fire out of Sawbench up the hill lovely.