now on bbc news, the untold story of 13 year old hazel hill — and her crucial role in the design of the famous spitfire and hurricane fighter planes — in the run up to the battle of britain. it's a wonderful aircraft, absolutely wonderful. it fitted you like a glove, you see, that's what i liked about it. without victory in the battle of britain, i think it's almost certain that we would have been invaded by germany. it was a darn close—run thing. it is the most famous plane from world war ii. it played a crucial role in the battle of britain. but what we didn't know until now was the role that a 13—year—old girl played in its design. hazel‘s role, like so many others, has hitherto been untold. i think we can look back and be extremely grateful