Air Ecosse used to operate Dundee- Carlisle - Heathrow in the early eighties with Shorts 360's and Aberdeen- Dundee- Manchester (I think) with Bandeirantes.
The Heathrow flight was interesting - 2 and a half hours in a Super Shed cruising at 9,000ft did not make for a comfortable journey. I also seem to recall being told they did not have autopilots on the basis that "there is no point paying for one because that is what the first officer is for" although that may be an urban myth.
I think Loganair also operated a service to Glasgow in the very early days.
As people have said a nice small airport but I suspect unlikely to develop much of a route network because of its proximity to EDI, GLA and ABZ.
g45