On RAF Northolt on a mound 20 yards East from control tower - Restricted MOD site - no public access.
LOCKED All surface features remain intact but the ventilation louvres are missing and the BPI pipe is damaged. An aerial mounting indicates this was a master post. The hatch is locked. Internally the ladder has been removed and access to the monitoring room was not allowed as it is considered to be a potentially hazardous confined space.
A concrete building nearby was probably for aircraft observation. It consists of a half buried room with an open section now filled with soil. A brick Type 22 pillbox also stands nearby.
Opened in 1967 and closed in 1991.
