Thank you for clearing that up Righthandrule.. However I believe my argument still stands, in that Jet2 would be highly unlikely to operate those city type routes if they were to even set up at SEN. If they based there (and you say they only operate from their bases in the UK), then they would only operate routes like they do from their other small bases..
Even so, a similar rumour surfaced about NWI last year due to the PA-31 visiting, clearly the same has happened here.