Just for a moment, imagine cycling on, say, Snetterton for 100km. That, like many British circuits, is on the site of a former airfield. It is flat, almost always windy, boring, and quite busy. Can you imagine anyone even considering cycling on that?
Nearest circuit after that is, I think, Brands Hatch. Busy pretty much all day every day. Lovely circuit, but unavailable to cyclists.
So come on, to avoid me listing the rest, which circuits do you suggest the nation’s cyclists should use. And bear in mind these amateur/semi pro events take place at weekends. Or are you suggesting motor racing should take place on public roads?
And of course, on top of that, circuit hire isn’t free or even cheap.