Completely unmarked on the 1:50,000 maps (at present at any rate), although it's shown on the larger scale 1:25,000. A sign on the gate requests no motorised traffic to use the byway across these fields, which would very quickly turn into a total quagmire in wintertime.
Uploaded to Geograph by Richard Law on 30 January 2013
Photo © Richard Law, 30 January 2013. Licensed for reuse under this Creative Commons licence