In terms of routes, Edinburgh-Southampton has been the only public statement. If both Edinburgh and Southampton are minded to give out commercial deals for a second operator to join that route, it would surely be to easyJet and not Ecojet? Even if Ecojet does get started on the route, it would surely pave the way with the airports to offer deals to easyJet to replicate its presence on GLA-SOU with a daily EDI-SOU, at which point the rationale of their presence disappears.
Doesn't work like that, does it? If an airline wants to fly the route, the airports can't refuse.