Do we think there will be any additional base expansion also?
In the short term I would imagine the focus is on restoring profitability post-Covid and riding out the looming recession. Longer term, it will be interesting to see where they go next. Excluding London, the busiest airports not served by Jet2 are:
Liverpool, Aberdeen, Southampton, Cardiff, Doncaster, Exeter
Of that list, I would say Cardiff and Liverpool are the most likely. It depends on how much overlap their is with their own markets at Manchester/Bristol.
Then the big question is whether they want to try Gatwick at some stage. The south-east is about the only area of the UK they don't serve from existing bases, so i'm sure they could make it work. Getting enough slots to make it worthwhile might be the biggest obstacle.