I went out to check this section of National Route 13 and Regional Route 30 today. All the signage was fine. Green Lane in Thetford was a little muddy / puddly in places but was ok. The worst part was the Restricted Byway of Bridgham Lane. There were several flooded potholes, some covering the whole width of the track. Nearer the southern end, the sandy nature of the track meant the surface was not very firm, and could be slippy in places. I shall report this to Norfolk County Council to see if there is anything that can be done.