Hi Sue, Thanks once more for your reply. Thanks also to Averil and Frances for taking the time to help me out.
The mystery certainly deepens. You say there are too many Williams. I'm sure there are too many Corkhills!

The 1829 will that you mention. Because I am a complete novice, I am unsure of what to do next. I don't mind the cost or the effort if it brings about a satisfactory result. Will I have to get in touch with the church at Sunderland to order the film? I know I said it's an annoyance getting through Sunderland with the one way systems and volume of traffic, but if it has to be done, I don't mind. Please let me know.
The Robert I put forward with parents Robert and Judith Colquitte was just a possibility. As we know, due to the repetitive nature of the names, it is easy to think you have found the person you want, only to find it's yet another William or Robert or John.

A week or two ago, it looked like the barrier was going to be much further down the line from Robert, but here we are, unable to move. For the moment, hopefully!

I would be very pleased to hear from you.

Thanks again,

Tony