Win a copy of 'Lancaster' by John Nichol

HISTORY is giving away 10 copies of John Nichol's new book 'Lancaster', a passionate and profoundly moving tribute to the plane that Sir Arthur Harris, chief of Royal Air Force Bomber Command, declared was 'the greatest single factor in winning the war’. To take part in the competition, answer a question and enter your details below. To take part you just need to answer one question correctly to enter our prize draw. Find out how you can take part.