Thor missile site at former RAF Harrington including the Pyrotechnic Store and Classified Storage Building to the West of the three emplacements.

MATERIALS: reinforced concrete bases and structures.

PLAN: the Thor missile site lies in an isolated position surrounded by farmland, south-east of the former position of the airfield's runway. The three launch emplacements are arranged in an unusual linear configuration along a plateau. The compound is not extant, but can be traced; the concrete pad for the Launch Control cabins lies to the east and the Pyrotechnic Store and Classified Storage Building lie to the west within earthwork bunds.

DESCRIPTION: the southern (no.1) and central (no.2) emplacements retain most of the concrete base, the blast walls, launcher erector mounting, fuel dump pit footings and partially standing theodolite sheds. Part of a theodolite pillar rests against the shed of emplacement no.2. However, the concrete base of the northernmost emplacement (no.3) has been partly removed at the west end, and there has been further loss to the components of the emplacement, including the theodolite shed, although the blast walls and launcher erector mounting bolts survive.

To the west, protected by an 'E' shaped earthwork bund, are the Classified Storage Building and Pyrotechnic Store, built with metal frames and reinforced concrete panels. The Classified Storage Building lies to the south of the Pyrotechnic Store and has a tall vehicular entrance at the west elevation and a flat roof. The position of the Pyrotechnic Store on the accompanying map is indicative.

SUBSIDIARY FEATURES: to the east is the concrete pad for the launch control cabin and an associated fuel tank. Further east is the ruinous power conversion building.