No one goes through life thinking that they're the best friend of the lead character.
I grew up listening in awe to stories of their wartime adventures. My granny, Joan, was a journalist and wrote amazing letters to my grandpa when he was a prisoner of war, while my nana, Mary, was a Land Girl, then a Wren. They were so independent, resilient and glamorous.
When I emerge from filming I feel slightly out of synch with real life, but it's also a relief.
