1 From the picnic site, head right at the roundabout into the town. Stay right at the first fork and, after 200yds (183m), head right up a footpath to St Mary's Church. Pass the church and the castle entrance to the main road. Go right here and, at the top of a short hill, follow the footpath signs to the right.
2 Go down this footpath to the flood plain. Walk through a swing gate, before heading diagonally right to the far right-hand corner of the field. At this corner head right into the next field and then left over a stile into another field. Continue diagonally right to another obvious stile-footbridge-stile. Cut off the left corner of the field, aiming for the middle of the left-hand hedge.
3 Cross the stile here and walk straight across the long meadow, heading for the left of some farmhouses in the distance. After 600yds (549m), at the meeting of two hedges, cross a wobbly stile and continue with a hedge to your left. Cross an awkward double stile at the end of this field and keep following the hedge to your left.
4 Just after Boundary House to your left, go right along the obvious concrete track back towards Fauld Cottage Farm. Head to the right of the farm gate, off the concrete, to a stile. Over the stile, head straight across the middle of the field to an obvious gate on the far side. After the gate, head straight towards the castle, back the way you came.
5 At the left-hand end of the meadow, where the path meets the river, cross the stile and skirt left around the bank beneath a line of trees. Cross Mill Fleam to the weir and then head sharp right keeping a hedge to your right. Follow the faint path along Mill Fleam back to the picnic site and the car park.