What is recorded here
No new evidence exists to judge the claim. I must answer only with the facts already provided.
Scotland's National Record of the Historic Environment records Castlelaw Hill as Rig and Furrow (medieval) - (post Medieval). The official map says its point is accurate as follows: NGR given to the nearest 1m. The record does not by itself mean that the public may enter the place.
The historic-place record does not grant public access. Check current conditions and ownership before entering land or a building.
Places near here
Castlelaw HillRing Ditch House (prehistoric) · 88 yd
CastlelawBuilding (post Medieval) · 270 yd
Glencorse ReservoirBoundary Stone (19th Century) (1819) · 494 yd
Castlelaw FortViewpoint · 647 yd
Glencorse Reservoir, Glen CottageCottage (19th Century) · 656 yd
Allermuir Hill and the KirkburnMountain or hill · 1053 yd
Fraser Tytler MemorialMemorial · 1250 yd
C.T.R. WilsonMemorial · 1411 yd
Battle of Rullion GreenMajor battlefield · 1463 yd
Bell's HillMountain / peak · 1.2 mi
Mauricewood Road, PenicuikNo Class (event) (21st Century) · 1.6 mi
Green CraigMountain / peak · 1.7 miOther information
Photo: Richard Webb · CC BY-SA 2.0