I'm not in recruitment but from conversations from those that are, I'm led to believe that the aptitude and psychometric tests are used as discriminants in borderline applicants. You're not being selected on the basis of these tests but if there are doubts about you at the interview stage, they'll look at the tests to assist in their decision-making process. The truth is that if you can't be bothered with the aptitude tests, there's probably a lot of other stuff about BA you won't like either so perhaps it's best for all parties. Doesn't mean to say you're an inferior pilot but BA want more than just pilots these days. They are painful but since it's uneconomic to put every applicant through a full flight sim, BA obviously consider them useful. Furthermore, these tests have been running for many years now. If BA was unhappy with the results, don't you think they'd have ceased using them long ago?