easyJet dominates Luton on the routes domestically, there could be room for some flights to Manchester, Belfast City, Newcastle, Gurnsey and possibly a morning and evening flight to Inverness. While the Jersey and IOM routes could be increased to daily or even maybe twice daily!
easyJet have done STN NCL and it was axed, so cannot see LTN NCL being any more attractive.
BHD LTN would not make sense given that they wont see a competitor enter BHD onto that route, moving it over again, would make an establish route BFS LTN attractive to FR. Besides why would they dilute the current offering that supports up to 320s on some flights. Good loads and yields. GCI wont happen with easyJet 319, wouldnt work?