There was an interesting comment on Travel Weekly regarding this:
Jet2 is quite right to take a step back from this.
As the CAA states, 75% were in the customer's favour.
Looking at some of the 75% in customer's favour include:-
Mr. J from Norfolk.
Was told he had to pay extra for luggage as his case was 2KG over limit and refused to pay and did't take the flight.
Requested a FULL refund.
Received 100% of his claim.
Does seem slightly ludicrous?