Take the exit at junction 10 of the M40 and follow the A43 towards Northampton and Towcester.
When you arrive at Towcester (with a VW garage on the roundabout), take the second exit (left) signposted towards the A5 - Hinckley or Weedon. (NB: You do not need to go into Towcester).
Follow the A5 for about 10 minutes until you reach the crossroads where the A45 crosses over the A5 at Weedon.
Go past the Dodmoor House sign outside Weddon Motors (on the left) before taking the first turning left to Dodford (with a large weight restriction sign) just under a mile north of the Weedon crossroads.
Go over the canal bridge and Dodmoor House is immediately on the righthand side.