Hotel Hopper
Newcastle is a Boeing base and is perhaps likely stay that way for the foreseeable future. However, I understand that waiting lists for Boeing commands are very short at the moment. Joining on that fleet - in spite of your A320 experience - could find you based in Newcastle sooner rather than later. Chances are, though, you will be serving your time in Luton )left seat) whilst you wait for opportunitities further north.
Just my best guess of course, based on the current situation. This could change against you though, since I understand there were several recent applications from Teeside based Baby pilots who are facing base closure. If true, and if they are successful, you can expect the waiting list for Newcastle to extend quite a bit.
JB