know this is the Jet 2 thread, but to answer that last point referring to MON...
Have heard a few talking about a based A320 year round. The cabin crew advert in previous years has said seasonal staff at Edinburgh. This year it said staff for its Edinburgh base, no mention of seasonal.
As to Jet 2, TOM are doing one flight per week year round so if Jet 2 brought in a B752 they could easily fill a gap, and possibly Hurghada could be another destination not currently served from EDI