its the legalities buddy, caa deal on athsma on a case by case situation, but the airfoce have to rule out on it,
Goodbye dream hello mediocre office job, dont take that attitude with it, u can still fly just not in the airforce, many people set their dreams on the RAF and fall based on a medical issue, thats a fault with nature, it would be different is it was aptitude.
get a JAA class 1 medical so u know your fit, and then start to work towards your goals,.