Now I think about it, less and less property in the UK is being bought out of taxed income.
Buy in the 80s, pay off most of the mortgage under MIRAS: not out of taxed income.
Watch house price skyrocket well above inflation: not out of taxed income.
Leverage ludicrous house price to acquire buy to let. Offset mortgage payments & expenses against rental income: pay no income tax. (Actually, this house has been bought out of taxed income - the tenant's! Not the LL's who gets to own the house).
Come retirement, downsize into BTL. Cash in main residence. Not taxed as main residence.
Move into BTL, which the tenant has obligingly bought for you and you've paid no tax on.
Fantastic set-up! If you happen to be a SE property-owner of a certain age.
Not so much if you're disabled, poor or elderly without owning a central London goldmine. You know, someone who might need to use services provided by those taxes?