Thanks for the new thread @TheNuthatch
The people who will be really penalised by the Mansion Tax are those whose houses are worth £2-2.5 million <disclaimer, I’m definitely NOT one of them>
If your house falls in this bracket then good luck selling it - no one will want to buy a house just over the tax threshold, but if you stay you’ll be liable for the bill.
Be ready to see a lot of houses being sold for £1.99 million.
I wonder if there is a way round it - ie pay £1.99 million for the house, and then purchase fixtures and fittings in a separate transaction? You can be sure someone will try that one!