GRX
Yes I totally agree with Granada as well, I think it could be a good route on days when AGP is not operating.
I have at least four friends I know who travel to AGP but actually live in the Leon area so I am sure as you say there would be a demand esp as there are now no direct UK flight.
BTW Granada is a beuatifill city and well worth the visit for those of you that that have not been!