In a large wooded triangular compound on the East side of Bracknell Road (A3095) immediately North of an electricity sub-station.
DEMOLISHED All surface features have been removed and the roof of the monitoring room has been smashed and collapsed into the room and backfilled with soil. The backfill has subsided at one end revealing the back of the room with part of a bed visible leaning against the wall. The shutter at the bottom of the ventilation shaft is also visible.
Opened in 1960 and closed in 1968.