The death tax more or less ended the UK aristocracy, apart from the absolute top echeolon of the very richest and the special case of the Royal family.
e.g. https://en.wikipedia.org/wiki/Andrew_Cavendish,_11th_Duke_of... "Devonshire inherited the estate but also an inheritance tax bill of £7 million (£303 million in 2023), nearly 80 per cent of the value of the estate. To meet this, the Duke had to sell off many art objects and antiques, including several Rembrandts, Van Dycks and Raffaello Santis, as well as thousands of acres of land"
For perspective, the family - currently headed by the 12th duke, were estimated to be worth £910 million in 2024. They are not out of the top echelon, and are now structured much better for avoiding inheritance tax, which is also at a lower rate now.