I have to agree with Arrows too - te issue with having occasionally inconsistent answers is overcome by the number of questions you have to answer, ie. if you answer one of the questions differently because you're torn between two options (as can be the case), but the overall response is the same across many answers, there's no problem.
I too didn't really take too much notice of all the hype on here about that stage, just sat down and answered everything carefully and honestly but quickly too (recruitment people tend to say you get more accurate responses if you don't spend hours thinking about each one). I truly believe that some people just aren't right for this job, no matter how much they want it, and this (along with Stage 1) is a way of NATS avoiding interviewing candidates who are essentially unsuitable. Hard to accept for those who don't make it, but you're probably better off in the long run...
Just my thoughts of course!!!