There is a Permissive route leading down to Storrs Lane. Very useful as it cuts the time spent on a rather busy road. I have no idea how to edit the maps but I have taken a picture of the permitted route.

Download picture of notice from here:

https://1drv.ms/u/s!AmRaz46vkmIGsyPJ6w5j9OMiWp-N?e=JG4Pzk