I've located the family in 1851 now, with your help, thank you. What was misleading me was that I thought that George's wife was named Sarah, whereas she is recorded as Mary in 1841 & 1851.
If Mary's age is correct in 1851 (37) she would have been only 15 when she gave birth to Elizabeth, so very young.
To John, I assume that they married in Bromham, as that appears to be Lucy's home parish, and thank you for your kind offer.