I flew to the Ilse of Man last year, one way to pick up my plane. I was charged the 10.00 development fee, which was a bit of a shock because when I booked the ticket, no where did it mention an additional 10.00 fee to travel out of Blackpool. This fee was non negotiable, because you could not get through security, of which there were many I might add, unless you had the voucher.
Now, if they were trading whilst insolvent, that is illegal, and a claim may be possible from all those that paid the fee. Deemed fraud perhaps.......only because there was no chance of any 'Development'.