 No.122 was reformed in 1941 at RAF Turnhouse with the Supermarine Spitfire I to operate convoy patrols in the Firth of Forth, it soon moved south into England to become part of the Hornchurch Wing with cannon-equipped Spitfires and it flew sweeps over northern France and participated in the Dieppe operations.In 1942 František Fajtl became the squadron commander, the first Czech to lead a RAF squadron.