Bough Gap Mill is shown on the Trawden Tithe map which is almost 10ft square and covers Trawden and reaches north to the river at Ball Grove too. It is dated 1844 but was updated to about 1849. Unfortunately the map has localised damage making it hard to read in places. I attach 3 photos I took of the map last year. It numbers every plot and there is an associated tithe index/tithe record book with each landowner, plus tenants and occupiers where appropriate. This should indicate who occupied Bough Gap Mill at that time. The documents are in the Lancashire Record Office at Preston.