I have a side branch to a my tree that includes a family of Derbyshires from Whalley, near Blackburn. I found them on the 1911 census, but Nelly appears to be adopted. She was 5 in 1911. Her parents were Samuel Derbyshire and Mary Elizabeth Haydon. They had several children, among them Clare, who was 29 in 1911. Nelly might have changed her name to Eileen Vera Derbyshire, and she was a music teacher by the time she married - a George Walton, in Clitheroe around 1935, I think. I have been told by another member of my family (a distant cousin) that her mother was called Sarah Wood, who married James Swales - but that Nelly was the illegitimate daughter of the son of a wealthy Derbyshire Cotton miller. As of yet, I can find no mention of a Sarah Wood being married to James Swales, but I am waiting for further information.
If anyone knows anything, please contact me.