More information coming to light.
Martha, William's first wife, was buried on 9th April 1770 at All Saints, Darton, Yorkshire.
William remarried the same year, to
Ann Peckett or Peccett.
https://www.ancestry.co.uk/imageview...58?pId=5989176
27th November 1770 at All Saints, Darton, Yorkshire.
I have found three further baptisms at Darton:
William baptised 12th November 1771, buried 14th November 1771
William baptised 2nd April 1773
Joseph born 4th July 1775, baptised 20th August 1775.
After that no further baptisms at Darton.
I assume they then went to Manchester.
I have seen a couple of baptisms in the Manchester area so I need to investigate.