With the arrival of the Avro Lancaster, Hemswell took on a training role, becoming the home to No. 1 Lancaster Finishing School. This school was tasked with giving Lancaster experience to aircrews who had just finished their training at a Heavy Conversion Unit prior to posting to an operational squadron. During 1944, as Lancasters were then being used at Heavy Conversion Units, the Lancaster Finishing Schools were disbanded and Hemswell again took on an operational role. No. 150 and 170 squadrons took up residence and commenced flying bomber operations until the end of the war. The film "Night Bombers" was shot at Hemswell during this period.