sorry for delay in reply, I've been in hospital...
Margaret Robertson b. Ardoch 1787 married John MacKenzie, also b. Ardoch 1787
Their son George, born Ardoch 1816, died Nantwich Cheshire 1872, a railway man, was my 2nd g.grandfather. They had several other children, dates matching to census info.
I'd love to more about John and Margaret's parents, and anything about Ardoch itself C