Any question answered...

John Molineaux's Three Pimples cross training route takes in a couple of miles of NCN21, a section which includes a corner that is arguably the most technical single corner on the entire route.

I'd never do it on a road bike.

There's no need anyway, there are some lovely lanes that you can use instead.

Cheers Andy, I'll work out a route and chuck it in the Garmin.