In Trail 65 we head west again this time to the borders of Bedfordshire and Northampton, where a former wartime airfield evolved from a base for USAAF bombers into a centre of aviation excellence. First built during the Second World War, it supported critical missions over occupied Europe. In the post-war years, it transitioned into a leading site for aeronautical research, contributing to major advances in jet technology, carrier operations, and automated landing systems. Although official flying ended in 1994, the site continued to reflect a remarkable legacy, marking its place in history as a cornerstone of Britain’s military and civil aviation development.

In this trail, we go back to Bedfordshire and the former RAF Thurleigh.

RAF Thurleigh (Station 111)

Situated some 6.5 miles north of Bedford, RAF Thurleigh was built on land approximately 250 feet above sea level. Although not a high elevation, its open plateau setting – typical of many wartime airfields – exposed it to the elements. Surrounded by multiple river sources, the location benefited from good natural drainage, aiding its suitability as an airfield site.

The nearby village of Thurleigh has a long recorded history, appearing in the Domesday Book as La Lega*¹ – a name that over centuries, has evolved into its current form. In a similar fashion, the airfield that bears the same name, would come to be known under many titles of its own: RAF Thurleigh, USAAF Station 111, RAE Bedford, Bedford Aerodrome, and Thurleigh Airfield Business Park amongst others. Yet throughout its history, one theme remained constant – aviation.

The War Reaches Bedfordshire: Early Bombings and Construction (1941)

Thurleigh’s association with the Second World War began even before construction commenced. Isolated bombing incidents in the parish during 1941 – possibly the result of jettisoned bombs from German aircraft – marked its early wartime experience. Once the airfield’s construction began however, it quickly caught the attention of the Luftwaffe. On 17th April that year, eight enemy bombs were dropped directly onto the construction site, causing damage to the incomplete runway. A second attack on 12th August 1941 saw another eight bombs fall along the northern boundary, again damaging the airfield and rupturing a water main*². Both raids highlighted how conspicuous such developments were to enemy reconnaissance and subsequent aerial attacks.

Once land had been sourced, the airfield’s construction was carried out by the company W.C. French Ltd. and officially opened during the summer of 1941. At this early stage, Thurleigh was a modest airfield in size, suited only for fighters or light to medium bombers. Its first operational residents were the personnel from No. 18 Operational Training Unit (OTU), part of the RAF’s Bomber Command. Having recently adopted the twin-engined Vickers Wellington, 18 OTU (formed from the Polish Training Unit in No. 6 Group, in June 1940 to train light bomber crews for Polish operational squadrons) was tasked with preparing new crews transitioning onto bombers ready for active duty.

Though OTUs were primarily training units, they often found themselves involved in operational sorties, especially during periods of ‘maximum effort’. As a result, many crews suffered casualties, even before they joined a front-line operational squadron.

Following them, in October 1941, 12 Operational Training Unit – first formed at RAF Benson in April 1940 – briefly stayed here. Their residency lasting a mere month, it remains unclear whether it was the entire unit, or just detachments  that were present here during that time. It was also at this time that the first recorded aircraft landing took place at Thurleigh: Wellington IC R1234*³ touching down on the new runway, marking a small but important milestone in the station’s dramatic history.

12 OTU Were not the only training unit to reside here. The Central Gunnery School (CGS), famed for “training the trainers” remained here from December 1941 until their departure to RAF Sutton Bridge on the Lincolnshire / Norfolk border in April 1942.

First established at RAF Warmwell on 6th November 1939, the CGS would train both gunners of bombers and fighters in the art of aerial warfare, those attending having proven themselves in combat already. Once trained, they would return to their original squadrons and pass on their valuable knowledge to others.

Tropical Kit and Tragedy: The Brief Story of 160 Squadron (1942)

Thurleigh’s relative quiet made it an ideal location to raise a new unit, and on January 16th 1942, the ground echelon of 160 Squadron RAF, formed here. Created as a Consolidated B-24 Liberator unit under War Establishment order WAR/ME/448 (dated 31st December 1941), the squadron’s formation began with the arrival of 108 airmen, who were followed by a further 126 the very next day. Over the following weeks, the numbers of ground crew and support staff swelled, as it did, each one was issued with tropical kit, a move that suggested a deployment to the Far East.

Throughout the weeks that followed, the air echelon underwent heavy bomber training some with 1653 Heavy Conversion Unit at RAF Polebrook, while  other crew members were sent to RAF Upwood for additional preparation. In mid-February, the posting finally came through and the ground party departed enroute to the Far East. Meanwhile, the air crews transferred to RAF Lyneham in Wiltshire, where they collected their new B-24s before they too left for the Far east.

Tragedy and Transition – May 1942

The now quieter Thurleigh would then experience a series of tragic accidents. On 18th May 1942, Wellington IC DV783, flown by a Polish crew led by Pilot Officer J. Kilmcsyk, crashed shortly after taking off. Just moments after departing the runway, the aircraft suddenly, and without warning, dived into the ground; the ensuing fireball killing all five crew members onboard. The Wellington, along with the crew’s bodies, was later recovered and the airmen interned in the Polish War Graves section of Newark cemetery in Nottinghamshire.

This was the second fatal crash suffered by the unit in as many days, a tragedy that was compounded by another such incident the following day – although mercifully this time, there would be no fatalities.

Not long after this short but devastating period, 18 OTU departed Thurleigh, a move that signified the end of its ties, as a training airfield, with Bomber Command. For the remainder of the war,  there would be no further front line, RAF units assigned here, and attention now turned to its new owner, the United States Army Air Forces.

In Part 2, we continue our journey through Thurleigh’s wartime history. We see the arrival of the USAAF, and share their experiences both good and bad. We learn of the failures of the B-17 and how through innovation they overcome these problems becoming one of the most successful bomb groups of the war.

The full story of RAF Thurleigh can be. read in Trail 65.