Hi Allan,
Apologies for responding to an email that is a decade old!
I've recently traced my ancestry as far as a Hugh Lyall born 1814 in Caithness (via my Grandfather John Alexander Lyall and his father John Lyall).
I'm struggling to find to find Hugh's spouse or parents. I'm seeing a Jane Lyall in some of the Census results. Is this likely to be the Jean Sutherland you mention above?
Many thanks.