Because I saw a request for information about a Maudsley who marrried a Frankland who was my 2x Gt Grandafather's brother, I did some looking up in the Slaidburn registers which were recently published - I have both volumes 1600 to 1840ish.The Maudsleys were families from Field Head, Gibbs, what is now called Slimrow, and the Cockshutt Part of Easington.These farms are still around today or at least the buildings are.Some have been converted into country residences. e.g Field Head which has had a recent "makeover" in modern parlance. If you would like to me to send information I would be able to give you every bit of information from the Slaidburn registers.It is obvious that the family arrived there just before 1771 as there is only one entry in the 1600 to 1771 volume and from your info. it is from Clapham as your Henry dies in Slaidburn in 1816 aged 90 according to the register.I imagine that John of Gibbs is his son and John of Field Head his grandson. His granddaughter Ann b. 1803 was the one who married into the Frankland family.
I live in the south of England but was born and bred in Slaidburn and although I have been away 40 years keep in close touch and visit regularly.