Just watched it on iPlayer :-
https://www.bbc.co.uk/programmes/m000kzx7
As already stated, an excellent programme with enough detail to realise just how critical it was that the Spitfire and Hurricane specs be upped from 4 to 8 guns before production started. How important to this was a 13 year old schoolgirl and her mum's kitchen table rather depends on whether you are a proud descendant or simply a woke BBC presenter forever directing the conversation around to how vital was Hazel Hill's contribution to the BoB's outcome. One of her son's summarised it best by saying that the war was won by the efforts of many (millions) like her. Unknown, uncelebrated, largely unremarkable. We owe them all our present freedoms, which we in turn must also defend.