I don't think William and Hannah are anything to do with Harriet.
OK Judith. I will not pursue that line of enquiry any further.
If at some future time you change your mind and do come to believe that William and Hannah were her grand parents, most of their children, as shown on the IGI list, are quite easy to track through the censuses (they all lived a few doors from each other) but you will need to be aware when looking for BMD information about them that the Registration District covering Bilton changed during the relevant timescale as follows...
Tadcaster - 1837 to 1862 (May)
Bramham - 1862 (June) to 1869 (August)
Wetherby - 1869 (September)
Best wishes
DS
