For the volume of pax, Loganair would be my shout, right size aircraft for the job. Why not go the whole hog and bring back an EDI, just do alternate GLA/EDI through the week. Pax figures were pretty decent before they called it a day.
There is a good chance they may have had something in the pipeline for when they go it alone in September when they part from the Flybe franchise. Just thinking out loud.
Good to see these routes getting covered pretty quick.