o until a shortage of virgin land occurs and house prices are pushed that much higher (or Govt. grants become available) , developing the brownfield sites is uneconomic.
It isn't
uneconomic. It is less profitable for the house builders, yes, but that isn't the same thing as it being unprofitable.
Sadly Rachel Reeves a) is about as sharp as a spoon and b) is completely in hock to house builders. So instead anyone who objects to green land being concreted over is a "NIMBY". Unless they're called Rachel Reeves and are objecting to the expansion of Leeds/Bradford Airport, of course, in which case they merely have legitimate concerns.
I have a fundamental objection to any tax (or call it by what it is - confiscation) based on the value of assets held, be it cash in the bank or property owned, or any tax which is deliberately designed to substantially reduce the value of any of those assets.
In general I'd agree that the tax should only be on the income generated from those assets. As Dan Neidle shows, otherwise you end up with people paying more tax than they earn from the asset.
However I think we do need to look much more closely at how we are defining income.
If someone is land-banking then they won't be getting an income from the land. However we can quite easily apply a deemed income to any land held, and tax on the basis of that deemed income. This is precisely what happens when you claim welfare benefits- if you have assets you are deemed to have an income from them, and your benefit is calculated on the basis that you are drawing down this income.
I'd also disallow the costs of finance when calculating the income. We started down this road when private landlords could no longer offset the cost of any mortgage interest against income from rental properties. This should be expanded further.
Anyway, getting back to VAT on private health payments. It's a stupid idea, but not for the reason many people argue. It's a stupid idea because once the output is VAT chargeable then the input VAT can be offset against it. VAT on private health care would very likely reduce our tax take.