I didn't know about the Durham records on line - so a nice one for me to work with. Thank you. However, did look for John (and there was one born in 1791 and died in 1851 but not him. I bought it just to check the website out).
I have since emailed Durham Record Office, and asked about the St Michaels Bishoperwearmouth records as I can't seem to find them anywhere. Hopefully they can help.