As aewaite17 said, you don't want to make it harder for yourself (especially when only 3% of applicants get to the college and only 60% of them pass), posting on a public forum that NATS is incompetent in its work isn't going to make HR your best friend. It only takes someone with selective reading to think if they can't even organise interviews, how can they safety manage 3 million movements a year. O well you choose your battles, if you've done nothing wrong you have nothing to worry about.