Hi Rhillip,
The birth cert for one of the children would show Mary's maiden name. In the meantime, I had a look for Bentley on Genuki and found out that Bentley was part of Shustoke.
There seems to be only one John Taylor of the right age there in 1841:
1841
HO107/1127 22 5 5
Shustoke, Warwickshire
Bentley
Isaac Taylor, 30, Lab
Elizabeth, 30
Hannah, 12
Sarah, 10
Mary, 8
John, 4
David Blower, 75, Lab
All born Warwickshire