This is going to be tough for people who don't live nearby then.
They're the people who made the route, and seem to be the only people who have any information as to where it is. I can't find it on any up to date OS maps, and have thoroughly searched t'internet too.
They mentioned a fee plus a donation - surely the fee would cover the printing costs, and the donation is a bonus for them.
And as far as I can work out, there is more than one location where one crosses the other. And those two locations are a fair distance apart.
Perhaps whoever set the clue (I'm assuming they have a copy of what we're after) could email a copy to anybody who asks for it.
Still, if enough people grease their palms, maybe they'll reprint them.
I can just see the confusion in their office as they receive request after request