I used to work for AA at LHR, it is a great company to work for, I did ground handeling for the OAL department and had a great time, everyone is great. The interviews are straight forward nothing to it, but before the interview they will give you a pyschological test, numerical and verbal reasoning exam, it very easy nothing to worry about just answer as many question as you can, and do not, I mean do not answer them by just marking any square that will against you big time. the interview is very easy general question about yourself.
I hope this helps and sorry about the spelling.