Thanks for all the replies and various links, and especially for the links to the old ordnance survey maps Stan - apart from being able to put locations for the names I was looking for, it was interesting (and sometimes amusing) looking at some of the other markings. We are still trying to work out whether "Cluster of Nuts" was a comment on the people living there or whether there were a number of nut trees in the area!
I'll now just have to work out whether Squires was close enough to Billington for the various baptims to be children of the same parents (assuming that the family moved between the first two children, who were baptised at Whalley, and the second two, who were baptised at Great Harwood) - the father's name is the same, as is the occupation of husbandman, and no mother's name is listed for any of them. The facebook page Clayton mentioned might be of help there.
Again, many thanks.
Cathryn