Sorry to hear about your predicament, glad to hear you are fit again.
Can't help you with the CAA medical, but I do know I had a couple of colleagues when I worked for an airline in the UK who had gone through heart bypass surgery and got their 1st class medicals back again. You may get more response if you post this on the medical section. I'm sure it has been brought up before, did you try a search?
For your LSA question, try this website -
Learn to Fly - EAA Sport Pilot and Light-Sport Aircraft Information And if you don't find the answer you are looking for, try the "ask the expert" section.
Good luck, and when you come to Oshkosh to shop for your new LSA aeroplane, let us know
