This is brilliant.
My grandmother lived in Annfield Plain for most of her long life. She remembered 'Cornwall' very well.
Here's one of her memories from around 1900 I think:
Mr Trevelyan used to come around with a horse and cart selling fruit and vegetables. He was one of the Cornish tin-miners who came here after the tin mines closed. They got work at the Billy Pit and the houses they lived in, which were where Annfield Plain is now, were nicknamed ‘Cornwall’. Mr Trevelyan used to call "’Taters, apples, onions and them long things”. These were bananas which we’d never seen and mother never bought them.
Jennifer