Thanks for the reply.
John is not in my tree. I have come across a sailors log in my late Mother in Law's papers with his list of ships and dates of sailing. How she had this I have no idea but I thought I would try to find his family and return it to them. His DOB and place of birth is on it so I thought anyone researching him would start at Plymouth.
Hope this all makes sense!
Regards
Gaynor