I just read an article suggesting an annual tax of 1% on homes over 2million.
It doesn't look too bad at a tiny 1%, but it comes out as 20 grand a year. Just to live in your house, before council tax and bills? And that's if it's a 2 million house. If it's 3 million, it's 30 grand a year 
I mean my own house is not "even" worth a single million so I'm nowhere near any sort of mansion tax.
But that does seem a gigantic amount of money to have to shell out for absolutely nothing just to exist in your house.
Starmer's own home is said to be worth about £2million.
From independent:
Mansion tax
A mansion tax is popular among many Labour MPs and was a party policy under former leader Ed Miliband.
Reeves previously ruled out a mansion tax as shadow chancellor.
But there are now rumours that an effective mansion tax could be introduced by charging council tax on the sale of homes above £1.5m or even charging a 1 per cent annual levy on properties worth above £2m.
Just over 150,000 properties in England and Wales would fall into the £2m bracket today, according to Knight Frank calculations, mainly around London.