Question: During which was did Beatrice Shilling invent a simple technical device made to counter engine cut-out in early Spitfire and Hurricane fighter aeroplanes?
Sentence (from "Miles M.20"): It was designed as a simple and quick-to-build 'emergency fighter' alternative to the Royal Air Force's Spitfires and Hurricanes should their production become disrupted by bombing expected in the anticipated German invasion of England.
Relevant evidence: No