Never heard of it before but doesn't look a bad do. Entry fee's not outrageous either ;) Strange distance though. Why not make it a 100miler? :D
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Done it. Boring, boring, BOOOORING!!
85 miles will be enough thank you ;)
That said I've been told you do an extra mile and a half from end of The Ridgeway to finish in Avebury.
Not hilly enough Wheeze ?