Andy,
I have a family line on William b 1869, son of Isaac b 1847 and Nancy.
I had him listed as a Bancroft, and I thought this was how he was listed on the 1891 census.
Where did you get his surname of "Teal" from?
There was another Isaac living nearby at Haworth, who came from the Cowling line, but he was born earlier in 1828,and was married to a Sarah.
They had at least 11 children, some of who had a middle name of "Teale".
Is this of interest?
I have this family line as well.