Me and My Girl (1939)

After Bill Snibson, a Lambeth cockney, discovers that he is a descendant from the Earl of Hareford and that he will now be residing in a Mayfair mansion with a bunch of snobbish relatives, he still holds onto his plain girlfriend Sally Smith and his Lambeth roots, even if that means facing his terrible, aristocratic aunt. And maybe the simple chaps can teach the rich how to have some fun: "Once you get down Lambeth way/ Every evening, every day/ You'll find yourself - doin' the Lambeth walk". Adapted from the highly successful West End musical which also became an early TV broadcast.