Hi Caroline
Sorry - I've only just seen your posting - good to hear from you.
What were the names of you grandfather and grandmother? Do you have any references to support this? I've been trying to trace the Twidale's back from William but no joy. William (b1821?)had a son (also William b1839) who is mentioned in his father's will (1860 see
http://archiver.rootsweb.ancestry.com/th/read/DERBYSGEN/2004...) and both 1841 & 1851 census, but I cannot find any record of his death or emigration. His sister Elizabeth married Thomas Bagshaw (my great-grandparents) and they seem to have taken over the mills.
Regards / Peter Joel