An investigation by The Sunday Times and Britain’s left-leaning Channel 4 has revealed that King Charles, 75, and Prince William’s 42, private estates, the ancient Duchy of Lancaster and the Duchy of Cornwall, have accumulated vast sums of money by charging fees to U.K. charities and public services. The exposé, titled “The King, the Prince & Their Secret Millions,” alleges that these two royal estates, benefiting from tax exemptions, have funneled millions from public funds and charities, including entities like the National Health Service (NHS), public schools and even the British Armed Forc…