I had an interview with BA couple of weeks ago and there is NO written test! the email covers all vacancies so everything you may have in an interview. For cabin crew you go in, get measured and sit in a crew sit and do harness up, have a group exercise, 2 to 1 interview and presentation about BA (tho not neccessarily in that exact order). Try and be relaxed (easier said than done I know) and if you get stuck and your mind goes blank in your 2 to 1 just admit it and take your time! And GOOD LUCK!
I'm just waiting for my start date.......its driving me mad......