yes William married Charlotte Hill JunQ 1851 - that means Mar/Apr/June. The census for 1851 was taken 30th March, so unless you know that they wed between 1st March and 30th March they would still be single.
I cannot find a Charlotte Wallwork but I can find a Charlotte Hill with her family and a Wm Wallwork with his family. Are they of any use to you.
Fizzy