My gt gt grandfather was Jonathan Bartle, son of Walter Bartle. Walter Bartle's brother was Charles Kneebone Bartle, father of Josepha, Rachel and Henry. I have the marriage certificate for Charles and he did marry Susannah Jackman. They married 1 October 1842 in Mary Tavy, Devon.
Jonathan Bartle emigrated to New Zealand in 1875.
I would be very keen to swap information. I believe that you are my 4th cousin once removed.