There are ways around inheritance tax that are not that hard to pull off. If you are very unlucky you may get stung, but if you really don't want to pay you put your assets in to a business and put your kids or whoever will be the beneficiaries of your estate on the board, as you get more frail you bail out of the business and make them the CEO/owner. The assets contained within it are then theirs. Clearly when they take them out they make get stung for capital gains tax, there's ways around that too; one of my customers inherited a business from his dad who died quite young (64), he sold it for £23m and fucked off to Monaco for 6 years. The cost of the flat in Monaco is immaterial, as when you finish the 6 years in your gilded jail you sell it for the same amount you bought it for. And you don't need to sit in Monaco the whole time, just not spend too much time in the UK...
I'm sure this advice will be gleefully taken up by many, many urbs...