Merlin engine - would that not make it a post war Spanish Hispano Aviación HA-1112, or would it be a re-engined German Bf 109/Me 109?
I also Googled this intrigueing fact: Designed by Willie Messerschmitt in 1934, the Bf 109 was first flown in September 1935. This prototype was powered by a Rolls-Royce Kestrel in-line engine because the engine that the Bf 109 was designed for, the Junkers Jumo 210, was not yet available.