Thorny,
just had an afterthought, it could be possible that you are linked to the Cockshotts through the wife of John Cockshott.
Kildwick parish records:
John Cockshott of Silsden Moor, weaver, bachelor, to Hannah Smith of Silsden Moor, minor, married on the 28th October 1773. at Kildwick.
It is this couple who had a daughter Ruth
From the IGI,
Ruth Cockshott, b. 18th sept 1788, Silsden, Kildwick, baptised 21st Sept 1788 Kildwick.
Parents - John Cockshott and Hannah.
It is this Ruth that shows up in later census as a spinster.
1851, Ruth is age 63, unmarried, born Silsden. Housekeeper to nephew.
HO107/2288 folio 122 P. 64
There is quite a lot of children for this couple, I do not have the baptisms only what is on IGI, but found a couple of burials for some of their children.
Of course you would need to work your way back on the Smith line to see if there is a link - and we all know how much fun the Smiths can be.
cheers
Margaret