I just did the test today at Manchester and the funny thing is, the personality test that I did, doesn't seem to be the same as everyone else's.
The one I did only had 40 questions and there were 2 statements. I just had to select which I thought suits me better.
e.g.
I like to plan ahead or I take problems as they come
I felt that the test I did was quite reasonable as it shows to NATS what kind of person I am. Wasn't too bad in my opinion.
One question however, there was a question about an aircraft having a failure and you have to select a suitable airport x nm away. To my calculation, the aircraft could make them all, so do you select the airport that is so far that the aircraft would be 10nm, 20nm away when it reaches sea level.