Plane / Planes / Aircraft / Aeroplane / Airplane appreciation

Would the MoD allow one to keep a 'trophy'

During the conflict, no. First off, it wasn't the MoD, it was the War Office because we called a spade a spade in those days. Downed enemy aircraft were inspected if of a novel type, otherwise sent for scrap as they contained strategically important materials, mostly the aluminium. Of course, people kept small fragments as trophies, but a substantially intact airframe would have been hauled off by people like great uncle Will, who spent most of the war driving a Queen Mary