Just info in case it affects anyone else here; the A1075 is currently closed between Shipdham and Watton (Norfolk), and the (often heavy) traffic is being diverted along wholly unsuitable lanes which form part of the route of NCN13.
The section of NCN13 affected is from the junction at Hills Road (coming from Bradenham) to Saham Toney. This is a narrow section of road, quite twisty, but there are plenty of passing places.
It's fun watching the buses trying to negotiate their way past artics coming the other way.