For those who are wanting to locate ancestor's graves at Bilston Cemetery you can call Wolverhampton Council Archives and ask for bereavement services. They're really helpful.
I contacted them and was given a grave number for my grandparents. Turned out to be wrong on the council maps but the grave diggers sorted it out for me. They were very helpful and managed to locate the grave for me. It was a couple of plots down but had no head stone.