Kelvedon Hatch
Essex
Tel: 01277 364883
Open daily 10:00-16:00 with tours on the hour. Formely top secret, this huge underground structure is an excellent example of an R4 Rotor bunker built in the early 1950s as a Sector Operations Centre for the Metropolitan Sector of Fighter Command. It later became a Sector Operations Centre for UK Warning & Monitoring Organisation, and then the Regional Government Headquarters for London. Being well hidden in a wood surrounded by farmland, it is not easy to find. It is just to the west of the A128 about half way between Pilgrims Hatch and Chipping Ongar, near Kelvedon Hatch. Admission: Adults £5, Children £3, Family £12.