Sorry to hear about your heart troubles Old Timer but glad you have been treated and should be on the road to recovery. One of my work mates was in a similar position to you, once he got the stints fitted, he had to attend the hospital heart nurse for physical training exercises twice a week for four months. Once the four months were up he was fitter than he had been for decades
I don't know whether Norfolk and Norwich Hospital have a recovery exercise program via a dedicated heart nurse but if they do you should attend because you will get advice on diet and will
exercise under controlled conditions. It's tough but well worth it
I would leave the scooter option until 2011 because you will be back on the road soon and if your on the e-bikes you should get even more miles per fully charged battery than you previously got
Don't try and over-do things though, recovery takes time.