"How many health insurance policies in UK contain cover for cancer treatment for example?"
You are equating health insurance policies not covering some treatments with the treatments not being available privately (at least in the UK). Harley St offers pretty much any treatment possible - if it's not available in the UK, they will provide a way of getting you to where the treatment is offered and ensure you are looked after for as long as you need. It may not be cheap or effective, but that's a different criteria to the one being discussed.
Biting the hand that feeds IT
