BA have a problem recruiting pilots because their own standards are quite strange, and the 'vetting' procedure so stringent. Not saying this because I'm bitter about not being taken on (I've got a job with a company I think is far better for me now). When I went for the day-from-hell, there were 12 applicants there, with 90% being totally suitable for the job. Most had type-ratings on BA aircraft, and those that didn't had enough experience to be able to show they were capable of handling a TR course. I think only 2 got called back.
The interview is not about you as a person at all, it's all about giving them the kind of BS they want to hear. What kind of examples could I give of leadership in the airline environment?? Well I'm 22, have been flying commercially for 20months - what kind of leadership do you think I have?!?!
Lots of my friends and colleagues have all been, and most got rejected. They are all extremely competent, and have great attitudes and personalities. Perhaps just not enough of the 'management' personality that BA want, and perhaps have too much 'I love flying'...
If BA can't recruit enough crew, it's their own fault. They've had hundreds of applicants, and I'd guess maybe 75% were totally suitable.