Totally agree with VJW - not passing which is my case I admit, but it does not make you any less significant, there are over hundreds of pilots in BA who come from airlines like BMI for example who didn't have to do the selections but yet very high standards pilots and a integrated asset within BA, some of the pilots at BMI when it was up and running attended BA and failed the selection but now integrated within the company post BMI and again are of high standards including pilots integrated directly from LGW Cityflyer after the year 2000, so the test does not prove anything but simply an excersise that you have to do in order to satisfy BA recruitment team.
I am sure if you make a very senior TRE Captain who has been in the company over 25 years and ask him/her to sit the selection they may not pass, does that mean they are not BA material, who knows maybe even if the pilot recruitment manager sat the test the results may or may not be favourable.