Thirty yards west of the bridge which crosses the River Colne at Cook's Mill is a concrete, hexagonal, FW3/22 pillbox. It is on the north side of the driveway and the entrance, sealed with corrugated iron sheeting is on the west side. The walls are 7ft 3in long x15in thick and there are six loopholes, each 10in wide x12in high with steel side pieces.<1> Inside there is no central pillar, the ceiling has been fibre-boarded over and electric fittings and wiring have been installed.

One photo of site.<2>

See also <3>.