Hi Julie,
I am pleased you have kept tabs on this thread, who knows what can, or will be, discovered about the Burnside/s clan. I for one will keep on searching, and building the Burnside/s family.
PS if anyone would like a copy of the excel document I have, which has IGI batch nos and BTs details wherever I have found them, then PM me I will gladly let you have a copy. I must warn you this is not for a single family but for every Burnside/s I have found information for in the north east c 1663 to c 1886, and is by no means complete.
Gary