If you are entering Keinton Mandeville from the A37 take a right turn at the first crossroads down Coombe Hill. If entering from Somerton take a left turn at the crossroads down Coombe Hill after passing The Quarry Inn on the left.
Descend for about 1/2 mile and take the first right turn by a triangle with a large tree in the middle (a no-through road).
Continue down the small one track lane passing Coombe Hill Farm on the left and The Mill Barn is to be found just along on the right over a tiny bridge.