Many thanks Alan for all this information. I haven't had a chance to look at it in detail but it is really exciting and I am going to follow up on the leads you have given me. It's as though more and more pieces of the puzzle are coming together.
The baptisms are really really useful, I had found some of them on Family Search but they don't give all the information that you have given me, for example William's Parish and birthplace. Please can you tell me where you found them?
The baptism for John Burn in '41 is interesting too because William Tinmouth/Tynesmouth is the second husband of Elizabeth Bainbridge John's grandmother. He is living with William and Elizabeth on the '61c.
Thank you again
Jen