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I think the D12 is basically the same as the Nat 24hr isn't it? In which case I've ridden it a LOT.
How easy is it to do without support? Is there a single point to leave the car with supplies in it which I can access on the whole course?
From your writing it sounds slow though, I thought it was a relatively fast circuit?
The start circuit is basically some twiddly single carriageway followed by a whole north and south circuit. Then there's a few laps of the south circuit, a few laps of the north circuit, and then there's the finishing circuit. The south circuit is fast, provided it's not too windy, and reasonably smooth. The north circuit is fast but punishing due to the road surface. The finishing circuit is slow. Overall it's pretty fast though. I don't think it's as fast as the H12H/8 course, due to the finishing circuit, but it's pretty speedy even if the north circuit is deeply unpleasant due to the road surface.
I think the D12 is basically the same as the Nat 24hr isn't it? In which case I've ridden it a LOT.
I'll have to remind myself of it. It was years ago - https://www.cyclingweekly.com/news/racing/torrential-rain-affects-north-norfolk-wheelers-100-mile-time-trial-30522
From your writing it sounds slow though, I thought it was a relatively fast circuit?