Buy to Let Building Insurance

Not in the least. What you are asking, goes right back to what we Republicans/Conservatives are talking about. For the government to give subsidies, would mean that the government would have to raise taxes in order to give the subsidies, ie: Force the rich to pay even more in taxes.

Absolutely.
The elimination of programs such as Medicaid and Medicare and the State ran programs and then providing subsidies (based on income for those in need) enabling them to purchase insurance would result in a tremendous savings for taxpayers.
It is a fact that there are those who cannot afford the total cost of health insurance. The provision of vouchers to these people would result in private insurance companies competing for their business, lowering the overall costs of policies for all. Emergency rooms would not be treating uninsured, lowering their costs.
An added benefit for the current recipients of medicaid and medicare would be an elimination of a two tier system which stigmatizes those recipients and sometimes results in inferior care.
Although, I do not have numbers to show savings, I believe that private companies can provide better care for less than the more than $640 billion spent last year by the federal government alone on these programs.( not to mention the unfunded obligation to those who have paid in but have yetyet to use Medicare of $34 trillion)