Start at layby east of Didmarton village (ST 82571 87787), head east along A433 to crossroads at Hare & Hounds pub where left along minor road (Bowldown Road) to junction with A46. Turn left onto A46 to junction with A433 through Didmarton past start. Repeat twice more, finishing at the end of a layby on the A46 (ST 80891 90563) on the fourth circuit. Each complete lap is appx 13.8 miles, followed by a further 8.6 miles to the finish.