From the parking area, cross back over the A285 (Halnaker to Petworth Road) towards an obvious drive and a green public bridleway sign. The drive immediately splits into three. Take the centre route. The walk stays on this track for some 1.5km, initially past a flint built house (on your right), past a metal traffic barrier and through a beautiful wood. The wood itself is nicely spaced and remarkably clear of any undergrowth giving it a beautiful serenity. The track through it is remarkably dry even after a lot of wet weather. Stay straight ahead for the 1.5km, finally exiting into open downland.
Continue on the track and in 200 metres, as you meet some trees by a three-way fingerpost, fork left (just by 30 degrees or so) to follow the bridleway and walk to the LEFT of the trees. Walk the entire length of the trees (780 metres) towards two aerial masts. At the end of the wood you meet the South Downs Way at a five-way finger post and reach the first seat with a glorious view.
From Seat One, set off leaving the seat on your left and the gate leading to South Downs Way on your right. Walk ahead with a fence on the left and a thin hedge of shrubs and small trees on rising ground to your right. You are aiming to pass to the left of two large aerials which are in a small wood ahead. Walk for 470 metres or so, to pass the wood with the aerials on your right and to meet a track at a T-junction with a triangle of grass.
Turn right onto the track and now walk with a small wood on both sides for approximately 330 metres. Emerge from the wood to be greeted by expansive views. There is an open wooden fence on the left and a wire fence on the right. In the wooden fence on the left, a gate leads into an area which includes a small pond and a rather grand seat. I recommend you take advantage of the seat to enjoy some fabulous views to the north west.
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Seat Two to South Downs Way
Having dragged yourself away from Seat Two and the views, turn left to continue in the direction in which you were going. In 330 metres, at a three-way fingerpost, turn left to join the South Downs Way. Walk for 330 metres and pass through a (most likely open) five bar gate. In front of you is a junction, with a track leading off to the right and ahead a small car park. Here you have two choices.
FOR THE SHORTER WALK (which varies from the published GPS map), you should take the track to the right. Follow this track for a straight 200 metres, ignoring any side turns. You will reach a crossroads of paths with a four-way fingerpost. This is the point where the route rejoins the main walk (within the section called 'Leaving Point to Seat Three'). Turn right to join the main walk, heading towards Seat Three (and now skip to the directions from that point).
FOR THE FULL WALK, continue to follow the GPS map and walk ahead towards and through the car park.
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South Downs Way to Leaving Point
To continuing on the LONGER route, pass through the car park and follow the South Downs Way, which leaves the car park to the right of the car park access road. The way ahead is obvious as the track cuts a very clear path across Bignor Hill with expansive views in all directions.
This section of the walk is 1.5km and at the summit of the hill you will pass Toby's Stone. This is a horse mounting stone, dedicated to Toby Wentworth-Fitzwilliam, the secretary of the Cowdray Hounds. There is also an old Celtic legend that a dragon had its lair on top of the hill and its remains can be seen in the folds of the ground.
This section terminates when the South Downs Way takes a sharp left to go downhill, with a track (with grass growing in the middle) going straight ahead. Your route is to take the track straight ahead.
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Leaving Point to Seat Three
Leaving the South Downs Way, walk straight ahead on the track with grass growing in the middle. After 250 metres, as the path bends right, a footpath meets your track on the left. IGNORE this and continue for 350 metres (turning right with the path after some 100 metres) to reach an arable field. A waymarker points the way across the field, and the farmer has laid the outline of a track with a tractor to show where he would prefer you to walk. Head across the field and aim towards the tree line (see picture).
Enter the trees, walk through the wood for 400 metres to meet another path at a T-junction and turn right onto it. This is the Monarch's Way. Follow this new path for 230 metres and, when you near the exit from the wood, the path splits at a Y-junction. By this time you can see the start of open land down the right fork. Take this right-hand option.
When you reach the field (which is on your right) there is a two-way fingerpost on your right and a sign for The National Trust Bignor Hill.
Continue now with the field on your right and woods on the left and, in 340 metres, pass to the left of a five bar gate and continue on the same track. In 300 metres the track meets a crossing track at a four-way finger post.
This is the crossroads where the two versions of the route merge once again. IF YOU ARE FOLLOWING THE SHORT WALK this is the point where you turn right to rejoin the main walk. IF YOU ARE FOLLOWING THE LONG WALK go straight across the crossroads of paths.
In either case, Seat Three is a few metres ahead on the right.
Leaving Seat Three to the right, continue on your previous heading to shortly bear left. IGNORE the track straight ahead as you bear left. There is an arable field on the left all the way along this section, which is some 440 metres in length.
At the end of the field on the left (and at the corner of the trees), turn right at a three-way fingerpost to enter the woods. Walk through the woods for some 150 metres. Pass through a five bar gate and, in about 20 paces, turn left and walk down to (and through) a small five bar gate to continue on The Monarch's Way. This rather beautiful section is also part of the Roman road, Stane Street. Walk straight to stay on The Monarch's Way for almost 2km, through open countryside, crossing a stile and passing through a small five bar gate en-route. Small round Monarch's Way signs mark the way at various points. You will finally reach the entrance to a wood, again with a Monarch's Way sign to the right of a small five bar gate.
Pass through the gate and continue a short distance to a multi-way junction, a large fingerpost, and Seat Four below it.
The multi-way fingerpost at Seat Four has place names on it, which is useful. Your task is simple, follow the direction for Upwaltham (a path to the right). The route which is uphill, goes for just over 1km. As the path climbs steadily, ignore any tracks or paths that cross the path and continue ahead until you reach the original track (from the outward leg) at a T-junction.
Turn left onto it and walk 1.2km back to the A285 Halnaker to Petworth road. Cross the road to return to the car park and the start of the walk.