Having tried to get this square from the south west sometime last year and getting stopped by HS2 completing closing the bridleway I copied
@Norry1 and attempted it from the north east.
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a mile down a private road, started off okay, a hardcore road, bit bumpy a few holes but nothing serious enough to slow you down, went by a farm and hit mud, by the looks of it, the side of the road was were the farmer was keeping his manure pile, it was bloody massive. Had to walk probably 30 or 40 foot as it was too muddy to ride through, both myself and the bike got absolutely filthy, but I got it. 100 mile ride for 1 square, i good have done it in around 74-75, but you have to extend it to a 100 when that close
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