Quite correct bluepilot, that is why the CAA may well be looking at Jet2 because of standards.
I have no way of knowing if they are or not, but my opinion and it is only an opinion, it is never a good idea of bringing pilots on sort term contracts when you know very little about them.
Cast your mind back to the pilot recently found to have forged his licence details, he was rumoured to have flown a season at Jet2 and l guess the CAA were not to impressed.