girlpower
Don't hold me to it but I believe Jet2 has some form of relationship with MultiFlight but not sure if they even offer a JOC Course. As you say, JOC courses are completely unregulated and vary massively in the sim hours involved. However, unfortunately some airlines use them as another method of cutting down the applicants and as such it has become latest fashion accessory on your CV.
As if people haven't already forked out enough money!