For Southend's sake I hope the airport gets a shout. It's a cracking little airport that never quite got a fair break. It also was a huge holiday airport in the 1960/70s. The catchment of SEN is about 600K and any time I've flown out from there is always seems to be predominantly locals flying to holiday resorts.
Perfect airport for package holidays;
Alicante, Faro, Malaga, Reus, Ibiza, Palma, Mahon, Murcia, Girona, Corfu, Lanzarote, Tenerife, Las Palma's, Madeira, Jersey, Split, Pula,. Some French points already served and winter ski. All very doable. Captive audience. 3 aircraft base totally feasible. Only question is can the 321N do it?
Separately, Jet2 have a big aircraft order and I'd not limit their future expansion to the UK. So I'd expect to see a mechanism (AOC) to allow this. Winter ski presents huge opportunities for charter flying and work around Europe in the low season.