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it came up in reconnaissance when I was planning mine.
this is my route - finally rode it this summer, it's sublime but you definitely need a proper MTB -
here are some other of platypus' greatest hits ™
lots of info in the description section of RWGPSWayfarer - better version of the king alfred's way
https://ridewithgps.com/routes/33393196
Norfolk
https://ridewithgps.com/routes/33035227
Chilterns
https://ridewithgps.com/routes/33407971
train to Scotland and ride An Turas Mor
train to Manchester and ride Second City Divide + Badger Divide
train south and ride the Chalk Ways
train to Edinburgh and ride the Pennine Rally
train to Cardiff and ride one or both ways of the Welsh Divide