‘The whistling on the theme tune? That’s Dickie Attenborough!’ Hayley Mills on Whistle Down the Wind

‘I’d just made two films in America. Shooting on a Lancashire farm was very different. There was mud everywhere – and we’d be eating dripping, jam butties and fried eggs in buns’ Whistle Down the Wind was originally a novel written by my mother, Mary Hayley Bell, about three…