I recall seeing a RVT whizzing round the peri-track
I don't recall the Fairies' RVTs "whizzing" anywhere. The RVT gearbox and its column mounted pudding stirrer was of the "keep stirring, you'll find one in a minute" variety.
If there was any "whizzing" to be done it was in the Landrovers with no brakes and 6 inches of play in the steering that we happily drove at 70, heeling over on the Gin-Palace bend like an Americas Cup competitor in a force eight.
(All air-side vehicles were robbed of any roadworthy bits by MT for use on the road-going ones)