RAF Wittering: nuclear fissile core stores, buildings A09, A10, A11, A14, A15, A27, Vw28, A29 and A33

RAF Wittering features a group of nuclear fissile core stores, specifically buildings A09, A10, A11, A14, A15, A27, Vw28, A29, and A33, which are designated as Grade II*. Each building is constructed from buff brick in a stretcher bond pattern and topped with a shaped flat concrete roof.

These single-cell buildings are designed in two configurations: six are arranged in a square plan to hold single cores, while three are rectangular to accommodate two fissile cores. Each store, or 'hutch', is a single storey and accessed via a concrete path. The structure consists of a square or rectangular block featuring a single timber four-panelled door, which is clad in sheet steel and set beneath a plain concrete lintel. Some doors still have their original locking mechanisms, and there are no additional openings. The flat roofs are made of shuttered concrete with an irregular wavy profile, intended to create shadows that mimic small trees, thereby confusing aerial observation.

Inside, each 'hutch' contains an electric tubular heater located opposite the doorway, although some have been replaced with hot-water radiators. There are small double-pole electrical junction boxes and Bakelite switches for a single overhead light. The floors are made of concrete and include receptacles for the fissile cores, which are cylindrical stainless-steel flasks set within raised concrete collars. The lids of these flasks are counterweighted, rotate when opened, and are secured with a simple turn-catch and spigot. In three of the stores, the flasks are positioned off-center to allow for a second flask, although all second flasks have been removed and the floors have been re-concreted.