good luck with the op Andy
lucky that you were able to get it diagnosed and are getting the appropriate treatment.
my neighbour had a similar problem and similar op a couple of years ago, being a marathon runner and a similar age to you, he couldnt understand why he was suddenly out of breath where he was normally still going strong so also did the sensible thing. he has made a great recovery, the health of his heart otherwise and his general good health and fitness levels sped up the recovery no end.
not a bad record to bow out with now really is it
all the best and congratulations again on your championship win this year