I think Jet2 have woken up to the (probable) looming shortage of experienced U.K. CAA Licenced Pilots, who also have the right to live and work in the U.K. Those two factors will have a big impact on the amount of viable applications going forward.
Out of interest, and slightly off topic, how are easyJet dealing with the post Brexit situation? How are they rostering between U.K. licensed and EASA licensed crew, and between the G and OE registered aircraft?