I agree with other comments, at 67 and having heart problems based on your age alone you should get the vaccine at the next banding which I believe is 65+, perhaps sooner hopefully.
I'm volunteering at a Vaccination Hub and we're having some very young adults through so obviously the criteria set out for those with medical conditions seems to be working. I also suspect that a great deal depends on the local CCG.
Shingles - Again. Have the Vaccine!