I knew someone who worked at GCHQ doing the kind of work they are hiring for with this. He was constantly looked over for promotion, and after some time pushed

I knew someone who worked at GCHQ doing the kind of work they are hiring for with this. He was constantly looked over for promotion, and after some time pushed his superiors to explain why. After some back-and-forth it was revealed to him 'off the record' that in his psychometric testing he had a "too great a sense of right and wrong" and didn't fit the profile for promotion. He shortly left the service. Consider carefully if this is the kind of place you really want to work. EDIT: I'm a British citizen if that adds anything to the above comment.