Hi Tony
Not UK CAA, but we're in the UAE under the local GCAA - who I have to say have pretty strict medical standards, but are also fairly proactive in getting guys flying again. When I get mine back I'm expecting a multi-pilot requirement, but that's no big deal for me as I already did 10 years of single pilot stuff and now fly Airbii for a living... So, I always have at least one F/O to look after me
The bizarre thing is, that after angioplasty and stenting you're probably a lot less likely to keel over at the controls than half the guys and girls out there right now!! When I had serious chest pains and angina my resting ECG showed normal........ The stress ECG however nearly killed me 6 minutes in
Another bit of research that backs this up is autopsies on soldiers' bodies - guys in their 20s - who even at that tender age have serious deposits on their artery walls. And they are fit guys!
Best of luck anyway