On 15 August 1942, the squadron temporarily moved to Redhill near London in preparation of the Allied raid on Dieppe (Operation Jubilee). No. 303 was to fly with No. 317 Polish Fighter Squadron and four other squadrons. Covering the naval and ground forces, No. 303 Squadron claimed the highest number of aircraft shot down of all Allied squadrons participating. No. 303 then returned to Kirton in Lindsey, where it remained until March 1943.