RAF Finmere consisted of three concrete runways, radiating from two adjacent points in the north-west corner of the site, with twenty-seven hardstandings and two hangars.
Built by the Air Ministry in 1941-42, it was commissioned by the RAF in July 1942 as a satellite to nearby RAF Bicester, which was an all-grass airfield and proved unserviceable during wet winter periods. No. 13 Operational Training Unit RAF moved to Finmere, bringing with them Bristol Blenheim Mk1 and Mk4 bombers. By the time of the arrival in 1943 of the similarly equipped No. 307 Ferry Training Unit RAF, formed at RAF Bicester in late 1942 to train pilots to ferry aircraft to northwest Africa, No. 13 OTU had moved onto the AmericanA-20 Boston and North American B-25 Mitchell, much heavier aeroplanes with tricycle undercarriage. The arrival of these aircraft meant that Finmere quickly eclipsed its parent station at Bicester in terms of operational importance, as they could not land at Bicester. The arrival of No. 307 FTU also aided its pilots' conversion to the more modern types, as they had the opportunity to fly them back-to-back with their own Blenheims. There were also occasional visits from Supermarine Spitfires and Hawker Tempests from the Fighter Affiliation Flight at Bicester, training bomber crews in retaliation and avoidance of enemy fighters. 1944 saw No. 13 OTU convert to the de Havilland Mosquito: over the next years, Finmere became a major centre for Mosquito aircrew training with almost fifty airframes available, turning out thirty trained crews per month for the war in the Far East. This was pre-empted by the atomic bombings of Hiroshima and Nagasaki.
Post-war and up to the present day
After the sudden end of the Second World War, Finmere was used to store large amounts of surplus ammunition, but was emptied and closed in the summer of 1945. The hangars survive in good condition and are used for light industry/agriculture, but all other surviving buildings are in an advanced state of decay: the former control tower is surrounded by scrap metal. The main east-west runway survives in its entirety, but only half of its length is in usable condition. Of the other two, less than a quarter of the length of the western runway survives, the rest now just being grass, while two-fifths of the eastern runway survives, albeit in unusable condition. The bottom two-fifths are now covered by trees, with the middle fifth being laid to grass. The site became known for its Sunday market which started in 1973, which gained local notoriety for breaking Sunday trading laws. The Tingewick bypass re-routed a section of the A421 through the northern perimeter road in 1998.
