Start on A38 approximately 1.5 miles South West of Buckfastleigh level with the clearway sign at the end of the lane out of Dean Prior Village and level with the 12th kerbstone (GR SX729638)  [What3Words = ///culminate.respected.hunt]
Proceed Northeastwards on A38 in the Exeter bound direction to pass Buckfastleigh, Ashburton, Bickington, Heathfield and Chudleigh Knighton.  
At Chudleigh Bridge filter left, turn right, give way, and turn right again to re-join the A38 in the Plymouth bound direction.  
Retrace the outward route to filter left at sign “Lower Dean”.
Finish in the slip road at point level with the River Mardle bridge parapet on the Right hand side of the road and nearest the give way sign (GR SX 733651)  [What3Words = ///breakaway.bronze.support]

NB: Allow between 20/25 minutes to reach the start from HQ. Do not cross the A38 to reach the start – see local reg. 1
 
Intermediate mileages (approx positions)
50 yards before Ashburton North Bridge   =  5 miles
First Bridge at Drumbridges                         =  10 miles 
Chudleigh Bridge                                             =  13 miles
50 yards prior to Alston Cross                     =  20 miles

"Classed as flat, but has a couple of big climbs in it!"