I understand your concerns and share your love of chocolate.
- a coronary angiography plus an angiography of the "brain
it does not sound like your symptoms are bad enough to justify this. Stents do not prevent heart attacks, the treat angina. If you are not having exercise related or exertional chest pain, a stent will not help you.
- if these arteries are found to be narrowed, an angioplasty
to widen the affected arteries - or the insertion of what I
believe is called a "stent"
See above answer.
- I also recall seeing a TV programme some years ago which
demonstrated what loooked like a "coring" of narrowed arteries
(i.e. like the way in which a cylindrical section of the
centre of an apple is "cored out" with a hollow metal device).
Is this technique still performed where narrowed arteries are
discovered in order to physically de-restrict them?
This is only done in severely occluded vessels. Again, if you are not having angina, I would not orer any tests at this time. The best thing is still risk factor reduction -- no smoking, healthy diet, statin for high cholesteral, blood pressure and blood sugar control, etc...
Any other suggestions to lessen future risks?
It sounds like you are on the right track. Invasive tests should be reserved for clear indications. Remember, there is a risk of complications with any invasive test. If that risk outweights the benefits, it is not worth proceeding.
I hope this helps. Good luck and thanks for posting.