determined..sounds similar to what happened to me. Had the initial class 1, and got a letter a few days later mentioning deviations on my ECG. anyway after a few sleepless nights I went back for the recall..they asked a few questions, did the ECG at rest again, and then did the ECG after walking on the treadmill for 10 mins (which is a lot harder than it sounds esp. when it starts going uphill). The doctor said it was fine and passed the medical. I was just relieved and didn't bother going into details but he said the abnormality was just something to do with my build and they need to check these things. Good luck!