Hi Maddy
Thanks, all interesting stuff.
The more I look the more David Logan(assuming there's just one) keeps popping up. He appears in Pigots Directory for 1828 listed as "Gentry". He also appears in the Burgess Roll for Berwick in several guises. He was mayor in 1803 and his name(assuming just one) is linked to several farms in Berwickshire. He appears to have been a person of some standing with a military history and interests in farming and politics. In particular he seems to be associated with Ferney or Fairney Castle near Coldingham. He is described also as the elder son of Richard Logan, which fits with other sources.
This, from historyofparliamentonline.org also suggests he may have been active in national politics:
"Nominating Ossulston, 8 Mar., the mayor Thomas Jordan Steel and the vicar of Berwick, Alderman Joseph Barnes, recommended him as a locally connected candidate and experienced politician. His sponsors, William Greive of Ord House and Alderman David Logan of Ferney Castle, Berwickshire, made similar claims for St. Paul. "
The quote relates to general elections circa 1820. St Paul is one of the candidates, Henry Heneage St Paul.
Given that he is a person of more substance than my usual Ag. Lab forebears, I would like to research him more.
According to my research I'm reasonably happy that a Jane Logan(1793 - 1874) married George Wallace(1795) but I would like to pin that down and ensure that it is the Jane Logan ie daughter of David Logan and Ann(Hall?). Some people have the marriage in 1815 but I can't find a marriage record. The death in infancy of a Jane Logan that Trish found is a troubling point but I can't see a reference elsewhere and clearly a Jane Logan survived to adulthood. One of the children's records on familysearch.org gives Mmn as Jane Logan.