When I left Uni and did a large number of interviews with various different companies, all of these bar NATS were done at my own expense. So you should be grateful that you get any money back at all especially if you consider the fact that given the large number of applicants, NATS ends up paying money to a lot of people who never end up working for them at all.
And as for slagging off the company before you've even started working for them. Not the greatest attitude in the world. At least have the decency to leave the whinging and moaning to those of us on the inside!!
I wish you good luck in your (probably long) search for future employment.