Barry,
I realise it's an age since you first asked the question, but I've only just discovered the Roper factor in my own family. I wasn't aware of any strong link to your particular area of Derbyshire, but I did observe a Hannah Roper and her daughter Mary living chez Boden in Wirksworth. The fact that Mary was born in Sandiacre (where I was born) is the trigger.
My great-grandmother was Mary Hannah Roper, born in Sawley in 1862. We think her father was John Roper (b. 1834) and his mother also called Hannah (b. 1797). It looks as though the family was based largely in the Sawley/Kegworth area, so I may be barking up the wrong tree entirely.
Any information we can possible exchange?