For Aussie Princess. I have to confess my Longmuir line is not as direct as yours. Kirkpatrick is my G3 grandfather. His son John Longmuir, born in 1833, married Bridget Welsh from Ireland. Their first born was Georgina Milne Longmuir, followed by 7 more children. Georgina Longmuir worked at Anniston House near Inverkeilor as a domestic servant, until the Groom, Thomas More, got hold of her and she had an illegitimate daughter, Mary Jane Longmuir, in Edinburgh in 1880. That was my grandmother, who married a James Howie in 1901. My mother was born in 1912. Georgina Longmuir went on to marry John Byars, baker, in Edzell and had a family with him. I have pix of where she lived and her gravestone in Edzell chuchyard.
We have visited all the little churches around Arbuthnott, Fordoun, etc and farms in Kincardine where the Longmuirs worked. Last weekend we visited Kineff where Kirkpatrick died. There are no traces of Longmuirs in any of the country churchyards, but that's to be expected, they were humble folks. If we can be of any help on your trip here, just shout!
Margaret