Sorry, No Shellfish
This is a weird one. One old rule in England is the Royal family cannot eat shellfish. This rule was created to prevent food poisoning. Prince Charles openly does not follow this rule.
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Sovereign Grant
Taxpayer money is collected in the HM treasury. Every two years the Queen gets a “Sovereign Grant” which is used to pay salaries, for travel expenses and to fund maintence of the palaces. In 2016, the Queen recieved £43 million or $57.5 million USD. Not too shabby!