This has come up before. It is perverse to spend hundreds of pounds on a medical you don't currently need to get an answer you can obtain for free.
First you need a proper report on your surgery. Your hospital by law has to keep your notes for seven years after you reach the age of 16 so you are in luck. Simply ask for a copy of the operation sheet and any letters or summaries from the surgeon. Send these to Gatwick in an envelope with a letter saying
'Does is exclude me from either a Class 1 or 2 medical?'. Wait for reply.
Turning up for a medical is more than likely to simply result in them taking your money and asking for the same report, because you have not been 'cured' but you have had correcting procedures. Bones and tendons have been moved and the doctor will need not only to assess your function but, I fear, want to know what was done.