A range of walking routes that I have written are available on ViewRanger. This software works on computers and smart phones and provides OS mapping with route overlays.
You can see and purchase my walks here. They include my ArchaeoRoutes range.
This route is free to view on the website and to download onto your portable device (eg. smartphone). In the widget below it is probably best to view in OpenStreet or Satellite mode. As a ViewRanger member you can also choose to see the route on a 1:25000 or 1:50000 Ordnance Survey map.