Visited this fascinating site today and just thought i'd add some tips for anyone else wanting to visit it. The coordinates were pretty much spot on I think, just don't make the mistake we made and approach the site from the top of the hill, it's far easier to find when you're walking up the hill!
Park up in Lordenshaws car park and take the path that heads straight up Simonside hill. When the hill starts leveling out, head to the right towards the scattering of rocks on the flat area. Thompson's Rock is easy to spot, it's the biggest there.
The trial stone is another large rock, to the east of Thompson's Rock. The deepest hole of the trial stone is near to the ground and gets covered with plants so might take a bit of spotting.
I approached Witchy Neuk by road from Rothbury (on mountain bike) Take the unclassified Rd which goes up past the cemetary and golf course. Turn right at the junction opposite Whitton Tower. (Carterside Road) Follow the signs for Newtown and Tosson, continue for about 4 miles through, Newtown, Rye Hill, Little Tosson and Bickerton. When you reach Hepple Whitefield continue a little further, to the edge of the plantaion on your left, and you come to a public footpath, also on the left. From here a short walk takes you around the north facing crags and on to the summit of the hill fort.
Its well worth exploring these crags as they are very wild and beautiful, with ancient Rowan's and Scotts Pine growing from the rocks.
The ramparts are over 2mtrs high in places and the dry stone walls supporting them can be seen.
It's also worth having a look at a cairn that is situated outside the hill fort to the SW. It appears to have been excavated, perhaps by Thomas Wake, who discoverd evidence of Roundhouses (Hut Circles) here in 1936
Several other hill forts can be seen from here: Tosson Burgh, to the NE also Harehaugh and the lesser known enclosure called Soldier's Fold to NW