Peter, my proper Plus 8 ( grin2) Rover V8, that is, fishtails too. Our golf club drive has an uphill start from the carpark and I often wind the boys up with a wheelspin/ arse waggle!
Easier in the wet but do-able in the dry as the tarmac is smooth.
That's with my electric trolley on the rack and clubs in passenger well so a bit of extra weight but not much.
The road slope is about the same as Shelsley.
I have done some runs up Brooklands Test Hill and my aim there was no wheelspin or waggle. Managed ok but just a hint of tyre squeal a couple of times.
I have considered doing the course, the only problem being I am competitive so would not be content just driving up without trying hard. I don't want to mangle the Plus8.
Now.......trailering a car to events with less worries about losing my pride and joy....maybe, if the right car was cheap enough. I have considered a Seven type kit....

Plus Four MY23 Furka Rouge