The image was taken in the 1970s in Hoddlesden, near Darwen in Lancashire in one fo the last cotton spinning mills in production. The spinning mule was invented by Samuel Crompton of Bolton between 1774-1779 and helped hasten along the industrial revolution. It is of course, the classic image associated with child labour where children routinely cleaned the loose cotton from under the moving mule frame, with many children being hurt, maimed and even killed.