To confirm everything above, indeed it is a matter of getting test results done and speaking with your GP. In my experience, I had to get multiple tests done, I then included a letter from my doctor with his assessment which complemented the test results, which he sent directly to the RMO on my behalf, as well I included a letter on my own. The letter I personally wrote likely didn't have an impact, however it allowed me an opportunity to reiterate my entire history to the RMO who may have otherwise passed over it and gone directly to the initial recommendation from my recruitment medical. I left no stone unturned and ensured the RMO had all the information. After 6 months I was cleared. There are certainly no guarantees, and rest assured the onus is entirely on yourself. But be patient for results, be diligent in the information you provide, be committed to the process if you feel this is what you want, but also be accepting that a medical standard exists for a reason. Good Luck.