Thank you again, Anne.
This is what I have but it is tentative as it presumes all relevant baptisms are on the IGI.
Joseph Flather was still alive in the 1851 census, a widower aged 86. Hence he was born around 1765 and there is a non-conformist baptism at Northowram on 20 Apr 1768, father Hugh Flather.
If the marriage to Grace Lister is correct, Joseph was a weaver of Northowram when he married in 1789. He was still in Northowram in 1841; his occupation being given as a shop keeper.
The only tentative burial I have for Grace Flather (nee Lister) is on 29 Apr 1836. The IGI just says 'non-conformist Halifax'. Is this the same burial you referred to?
If, as you say, she was born around 1760 then there is a baptism at Lightcliffe (which is not too far from Northowram) on 6 Apr 1760, father Will. Lister. Grace was denoted as living at Hipperholme when marrying in 1789; again not far from Northowram.
There are the following baptisms at 'non-conformist Halifax' (presumably Northowram); father Joseph Flather :
Joseph, 24 Oct 1787
Mary, 3 Sep 1789 - which fits with a marriage in April
John, 2 Sep 1790
Jane, Dec 1793
Ann, 22 Apr 1798 - my 3G Grandmother
Susannah, 5 Apr 1801
I do not have dates of birth for any of the above.
I am back to square one as the baptism of Joseph does not 'fit' unless your suggestion that Joseph and Grace were living 'ov'r brush' before they married is correct.