The *N* no longer binds the NHS together

During their in-house fracas both Mary Riddell and Dan Hannan have ignored one rather salient fact about the United Kingdom's "National" Health Service.

Here's a clue:

Aneurin Bevan's NHS was the only major religion to emerge from the 20th century. It has bound together people of all classes and political views who stand united behind an institution that oversees, more or less competently, the irreducibles of birth and death and the crises in between.

Wrong, no longer the case.

Woe betide any prime minister who presides over NHS collapse.

Simple question, which Prime-Minister did preside over the NHS's collapse and why?