What you have to remember Mach is that Flybe currently have over 800 applications for positions as pilots. Nobody can be expected to remember that many names so they ask for a photo to help them remember the people that they are interviewing. There is nothing discriminatry at all about it, it's just there as a trigger for their memories when reviewing the candidates.
Also when I attended my Flybe interveiw they did ask for all of our date of births. Although even if they hadn't these could have been obtained from our passports when we handed them over...