Thanks Derek.
That is the correct family. I have them back a couple of generations further through other records, including wills, which prove the relationship. I also have plenty of detail of most of their descendants.
John b ca 1726 was my 5th great grandfather and (as you mention) father of Molly, for whom the PR includes a baptism in 1759 but for whom I have found no subsequent records.
James b ca 1730 was (according to the PR) the father of Mary, who died 2 Nov 1789 aged 29 (and was buried 4 Nov) but for whom I have found no preceding records.
I actually did the research several years ago but have just come back to it and picked up on a family that I never managed to tie in, that of Thomas Platt of Hill Top farm in Glossop (one of three adjacent farms, with Mouselow and Shaw, which the family had for years). I have now found that Thomas was born illegitimate to Mary on 15 October 1789 (bpt Tintwistle 28 October 1789). The problem is which Molly/Mary?
When Dolly's husband died he left legacies to his children, to Dolly, to the widow of the brother of Dolly & Molly and to Thomas Platt of Hill Top farm, the implication being that Molly (bpt 1759) was Thomas's mother, rather than Mary (d 1789).
It is, though, rather strange that Mary (assuming she was a different person) should die just after Thomas was born (when death from childbirth complications was common) when there is no previous record of her. In addition, her supposed father James had a son (another John) baptised on 27 Jan 1761 but no baptism for Mary supposedly born a few months earlier (if, indeed, there was time for that birth as well).
My reason for wishing to view the film is to see if it is possible that the naming of Mary's father as James in 1789 could be a badly written John and that, therefore, Molly and Mary were one and the same.
Sorry this is a bit long winded but hopefully it is clear
Graham