It is ironic but (again IMHO) these T&C's could be redrafted to be almost bullet-proof.
If I was with Jet2's legal department I would make it a priority to get these right, to protect their interests and the interests of their staff and crew.
It would be a real embarrassment for them if any prosecution was tossed out of court because of sloppy drafting. Just imagine the hysterics in the media.