In reply to Graeme:
Directions from hamilton ....
Drive down Hamilton Rd into Strathaven till you reach a T junction, turn right, down the hill and turn left at an island, pass a park on your left and turn right into a car-park just before the T junction.
Walk from the car-park across the road in the direction of the Castle and the Town Mill is the building on the left of the Castle.
Hope to see you there.