Hello Rob,
I'm sorry for the late response, but I've not been online today until now.
I wasn't sure if it was Barmby Dun or Barnby Dun me being a Southerner!

A huge thank you for taking the time to do that lookup for me. It is greatly appreciated!
I am wondering if Thomas Rusby (born c1766) and Robert Rusby are one and the same? I found the births/baptisms of Thomas 1798, Samuel 1799 and John 1801 on the LDS site, which gave their parents as Thomas Rusby and Mary Waterhouse, and because
their births/baptisms were at Barnby Dun, I presumed the parents married there too? But maybe their marriage was at Doncaster? Thomas Rusby, born 1798, is my husband's great grandfather x3.
Was John Rusby's baptism the only one in Barnby Dun?
Best Wishes, and thanks again,
Juble