Try contacting the local museum in Blackburn, and failing that, try a Freedom of Information request to the council - they will hold GIS maps of the borough going back years and should be able to help.
It's worth mentioning that putting
fourhouses blackburn
into Google produced a single result of "30 Oct 1814 Mary daughter of Samuel and Mary Dalton, Fourhouses, weaver" on a genealogy site. This suggests it might be in Oldham. Could this be right?
just to avoid any more confusion, that peachy post was me using my daughters puter round at her place earlier but not realising i hadn't changed the signing in name! sorry