Just to add to the EZY discussion, from what I've seen at BHX, domestic routes (especially if from another base) come secondary to that bases other operations and are fitted in without much care for frequency and timings.
It is very interesting to see that many thought that with the new EZY base, domestics from BHX would become BHX based aircraft but they (mostly) haven't with the same odd frequencies and timings
Not sure of current W ops but in the past they operated BFS-BHX-AMS-BHX-CFU-BHX-BFS for a season and I'm not aware of any regular disruption to punctuality whilst it operated so this could be a way for SOU to gain more Med frequency or a new route from EZY in 2025 - if the numbers work. Ideally it will of course benefit SOU for it to become an actual EZY base.....that took nearly 20 years at BHX!