Something ive wondered about inheritance tax is, if you know your going to be, couldn't you buy loads of diamonds, and give them too your kids. How does the government know of these assets, or would they be suspicious if you suddenly had a large sum of cash after the death?
They do asset tracing to follow money around. Not inheritance tax related, but a friend of mine works for a company that provides software to hmrc to trace dodgy people and their money and their networks of contacts.

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