I'd suggest the vast majority of cars are fast enough and agile enough to cope with the driving ability of the average Brit on the average British road. Anybody driving their car anywhere near it's limits, their limits or the limits of the road is being a bit of a penis. By the same token, it's really quite rare that somebody genuinely has a car and an ability that warrants a 'track day' or true private road experience. Although I have noticed that quite a few people that clearly are exceptional drivers on the verge of an F1 career that have been so impressive at the Nurburgring that they won a sticker, tend to drive a Corsa or Clio.