It probably helped as well that St Thomas's is literally within a few hundred yards of Waterloo Station.
The speed with which you can be in specialist care is absolutely critical when it comes to cardiac problems - which is a large part of the reason why survival rates are far higher in places like Central London where you've got both fast response time for paramedics (for London as a whole, ~75% of 'immediately life-threatening' calls have a response time of under eight minutes) and multiple world class Hospitals with specialist cardiac centres.
Even so, that's one hell of a lucky break your father had and fantastic that he both survived and is fine still!
The speed with which you can be in specialist care is absolutely critical when it comes to cardiac problems - which is a large part of the reason why survival rates are far higher in places like Central London where you've got both fast response time for paramedics (for London as a whole, ~75% of 'immediately life-threatening' calls have a response time of under eight minutes) and multiple world class Hospitals with specialist cardiac centres.
Even so, that's one hell of a lucky break your father had and fantastic that he both survived and is fine still!