Were any of these ladies resident in Caton on 1901 census yours? They were all born in Dorset.
Matilda Robinson, (b. In??? Minster), Harriet Ellen Walker (b. Urn (?) Minster), Annie Mason, Mary Goodwin, Martha Williams, Frances Miles/ Mills (?). As far as I can make out from the census they were all married. (Edit. Annie Mason and Mary Goodwin both maiden names Purchase.
Edward, sons George & William Purchase were all born in Dorset, Hetherbury/ Netherbury/ Petaldown.
Purchase was not a Lancashire name. There was only 1 family of that name in Lancs. on 1841 census, an excise officer, born outside Lancs. with an Irish wife. Birthplaces of adults with the name Purchase on other 19th century census included Essex, Yorkshire, Norfolk, Staffs., Shropshire, Westmorland, Gloucestershire, Cheshire, Somerset, Cornwall, Wales and Guernsey. Out of 24 in 1881, only 3 children of 1 family were born in Lancs.
Caton had 5 mills (2 silk, 1 flax), a bobbin factory and a tile factory.