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"I love that. It’s very polite," laughs Mulley.

"They don't know whether to salute her or to bow and kiss her hand," Mulley says.

"He takes her across St James's Park and it's spring and there's bluebells and birdsong and American GIs making out with the English girls, and he pulls from his pocket these silk stockings like an amorous magician and flirts with her," explains Mulley.

"I quite like the line she's the only person to parachute back from Britain to Nazi-occupied Poland in a dress because she's the only woman to do it," Mulley says.

"Previously when the Nazi Germans captured women who are involved in resistance... they considered them to be basically bandits or commandos and Hitler has got this Commando Order - after a raid on the Channel Islands, he said that anyone who is found fighting not in uniform will be shot without trial," says Mulley.