Problem with people like that is they're absolutely clueless as to how much an ambulance dispatch would cost, along with whatever else he's had done at hospital. I haven't got a clue how much that would cost, but 150 instances has to have racked up over a million £ in waste. The NHS should be empowered to seek recovery of funds from time wasters like that.
I remember watching some of the 999/Ambulance documentaries, and there's several instances of mentally unwell people who regularly call out for an ambulance, and the crew just know when they turn up that it'll be a waste of time, but unfortunately they have to act on the call as if it was genuine.