You're playing with fire mate, sorry. The med boards check the medical records of ALL applicants via a GPs medical report. You can lie on the forms, but they will find out anyway. I've personally never had asthma, but when they checked my med records they found that I had suffered 'mild wheezing' once as a child whilst suffering from bronchitis. That was enough for them, my med cat was pulled and I had to wait to see a specialist. Fortunately the specialist quickly summarised that I didn't have asthma, never had and never would, and I will soon be starting IOT to serve a commission as a pilot. So my advice to you would be not to lie, it won't get you anywhere. The RAF have got very good reasons why they don't select aircrew with a history of asthma, they haven't just made them up!