OAN field survey, located by GPS to an accuracy of +/- 1m. Searchlight batteries at Pen--Fron farm. Consists of concrete platforms, these are three small rectangular bases and one larger one. The largest is 15m long by 6m wide and the rest are up to 5m square. A small concrete stanchion base can also be seen at the road side but there are no fittings surviving. 002/10/07/OAN/NW