Sky28 - don't worry. I wonder they didn't check your weight at the interview (they did so at mine). They will check it when you do your medical, at the beginning of trainingcollege and at the end of it. If everything else is ok with you they might tell you that you have to gain some kgs - and leave it as that. Usually after trainingcollege it is never checked (so far) (rumours say that they might if you go for your upgrade - I will see next month
). I know some of EK-staff who are 3-5 kgs "underweight" (as well as over) - as long as you are healthy and able to do your job it's usually not a problem!