The Crabs
will tell you where to go quickly enough, i know of a lad who was accepted from a UAS, about to start IOT before they read his medical report and chopped him for having 'a slight wheeze' a age 11, or something equally as stupid. They have an almost zero tolerance policy on asthma, so unless you have a good case to contest it i would not even waste your time, however, if you do contest it, they will send you to some medical centre for special tests involving a running machine and a lot of excercise. RN and AAC are more than happy for aircrew as long as you have been clear for 4 or so years.
Good luck.
Mac