RAF Bicester: World War II airfield


Heritage Category:
Scheduled Monument
List Entry Number:
Date first listed:
Date of most recent amendment:


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The building or site itself may lie within the boundary of more than one authority.

Cherwell (District Authority)
National Grid Reference:
SP 59198 24756, SP 59234 24591, SP 59259 24522, SP 59260 24272, SP 59289 24369, SP 59292 24312, SP 59304 24440, SP 59356 24632, SP 59467 24481, SP 59712 24000, SP 60066 24014

Reasons for Designation

When the RAF was formed as the world's first independent air force in April 1918, and during the period of retrenchment which lasted from the Armistice until the early 1920s, its founding father and first Chief of Staff, General Sir Hugh Trenchard, concentrated upon developing its strategic role as an offensive bomber force. His primary considerations were in laying the foundations for a technology-based service, through the training of officers and technicians. Subsequently, more than 100 stations were built in permanent fabric between 1923 and 1939. Trenchard's expansion of the air force, given Parliament's blessing in 1923, was centred upon the building of offensive bomber bases in East Anglia and Oxfordshire, behind an `aircraft fighting zone' some 15 miles deep and extending around London from Duxford in Cambridgeshire to Salisbury Plain. This principle of offensive deterrence, although subject to fluctuations which reflected events on the world stage and varying degrees of political support, continued to guide the siting and layout of stations after 1933, when Hitler's rise to power and the collapse of the Geneva disarmament talks forced the British government to engage in a massive programme of rearmament. The continuing development of existing bases (some dating from the First World War), and the building of new ones thus concentrated on the establishment of training and maintenance bases behind an eastern front line, extending from Yorkshire to East Anglia, facing Germany. The completeness or otherwise of inter-war bases, and the extent to which they have retained their architectural detail, external fittings and inter-relationships as planned groups, is closely linked to the nature and intensity of their post-War use. Upper Heyford, for example, which was the test-bed for the planning of Trenchard's Home Defence Scheme stations, was greatly extended and adapted as a key USAF site in the Cold War period. Less intensive use - at present for administration, storage and glider training - has ensured that Bicester is the most complete representative of developments on bomber airfields for the period up to 1939. RAF Bicester is the best preserved of the bomber bases constructed as the principal arm of Sir Hugh Trenchard's expansion of the RAF from 1923, which was based on the philosophy of offensive deterrence. It retains, better than any other military airbase in Britain, the layout and fabric relating to both pre-1930s military aviation and the development of Britain's strategic bomber force in the period up to 1939. The grass flying field still survives with its 1939 boundaries largely intact, bounded by a group of bomb stores built in 1928-1929 and airfield defences built in the early stages of the war. The remains included in the scheduling are, along with the listed hangars and other listed buildings, the key structures within this military landscape.


The monument includes the southern bomb stores group and a series of airfield defence structures forming part of the former RAF Bicester Airfield site. These fall within 11 separate areas of protection (termed here constraint areas) as detailed below, and as listed above with their national grid references. The first constraint area includes the southern bomb stores group built in 1938-1939 as one of three intended Squadron bomb stores, only two of which were fully completed. The constraint area (the largest) includes a series of structures based around the High Explosive bomb stores (building 224). The bomb stores consist of two rows of three back-to-back concrete buildings with surrounding earth banking or traverses and a gantry running along both the north and south 'frontages' to allow bombs to be lifted onto bomb carts. The bombs would then be taken to the Ultra Heavy Fusing point building (building 226). This curved roofed corrugated steel and earth building was built with ten bays and could accommodate a bomb cart 'train' of High Explosive (HE) bombs under cover where the fuses were added, having been collected from the Component stores (building 214). Together these buildings show the methods taken to store safely and securely the components of the bomber armament. At constraint area 2, about 300m west of the bomb stores, lies a group of defences consisting of two mushroom pill boxes flanking an approximately 50m long double seagull trench - the former so named for their saucer-domed concrete roofs (set on to a cross-wall which provided ricochet compartments internally) and the latter for its wing-shaped plan, which maximised the arc of fire. These defensive structures combined to form a formidable ground defence group as part of the wider airfield defences. Constraint areas 3 and 4 include a pair of linear Defended Air Raid shelters to the east of the southern hangar. These brick, concrete and earth structures provided cover for defenders in the event of ground attack by enemy paratroopers and provided some protection against bombing and strafing by enemy aircraft. Of the three further pairs of Defended Air Raid shelters which protected the other three hangars that form the core of the Technical site, only a single shelter survives (constraint area 7). The shelters were linked defensively by a series of pillboxes of which two survive within the scheduling (constraint areas 5 and 6). These are based on the octagonal, type 27, pillbox design and formed part of a series of fixed defensive points around the inner core and perimeter of the air base. At the northernmost point of the scheduling lies a small air raid shelter (constraint area 8), intended for those using the adjacent fuel installation. Three further undefended air raid shelters, located close to the hangars to provide protection to ground crew in the event of air attack are also included in the scheduling. These brick, concrete and earth structures are situated within the hangar complex (constraint areas 9-11). Although Bicester was first used as an airfield in 1918, it is the Trenchard Bomber Base and the 1934 expansion period remains which make it nationally important. Blenheims, Halifaxes and Mosquitos all flew from Bicester. Bomber crews trained at Bicester included both British and many Commonwealth squadrons including Australian, Canadian and New Zealand airmen. From 1944 it was involved as a forward equipment unit for Operation Overlord (the Normandy landings), and after the war it was the home of the principal aircraft salvage unit for southern England. Its later use as a glider school while the domestic site was used for logistical purposes ensured it was not dramatically altered from its wartime layout. Excluded from the scheduling are all modern services and their trench fills, although the land around and beneath them is included.

MAP EXTRACT The site of the monument is shown on the attached map extract. It includes a 2 metre boundary around the archaeological features, considered to be essential for the monument's support and preservation.


The contents of this record have been generated from a legacy data system.

Legacy System number:
Legacy System:


English Heritage, Airfield Thematic Review, (2000)


This monument is scheduled under the Ancient Monuments and Archaeological Areas Act 1979 as amended as it appears to the Secretary of State to be of national importance. This entry is a copy, the original is held by the Department for Digital, Culture, Media and Sport.

End of official listing

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