Chating to an old friend still in the Jet2 family, he advises 165 pilots required to bring them up to full strength for next year with no expansion and that flights have been cancelled recently due to a lack of crew.
I don't know if he is correct, but it appears to closely match what other ex colleagues have suggested, if correct then the trainers are going to be stretched and so will the sim centre, this doesn't allow for any further attrition from "the airline of choice".