Exeter London Route
If this route goes ahead I think VLM is by far the most likely airline going to be doing it. Scot Airways is a possibility but I couldnt see it. Athought Flybe are suitable in that they have an Exeter base, I cant see it.
Apart from that not many more alternatives, unless a new player is going to arrive at EXT. I understand that BE is renegotiating all fees with airports in advance of the Bacon integration, as such I could see a new owner at Exeter keen to have a second airline with a base at Exeter?