On a low mound in a wooded compound on the South side of Northgate Lane and on the West side of a field boundary.
WELDED All surface features remain intact but the step is pulling away from the access shaft and the louvres on the ventilation shaft are missing. The hatch is welded shut. There is a pipe sticking out of the ground on the east side of the mound with some telephone cable protruding from it.
Opened in 1964 and closed in 1968.