The short route starts along the same path as the full route. The difference is that once you get to Shapwick, you don't do the second loop up to Pamphill and back. Just turn around, go back to the right-angle T-Junction at Tarrant Crawford, this time taking the signposted route towards Spetisbury going back through Spetisbury to Charlton Marshall. The short route is approximately 11 miles.
You can view the full route on the map below, just ignore the second loop off to Pamphill and back!
The Route | The Short Route |