The Royal Family are facing more controversy as an investigation into Prince Charles’ charity has been launched.The Prince’s Trust is facing allegations that a knighthood was offered to a Saudi billionaire in exchange for a large donation to the charity. Metropolitan Police are investigating the alleged offences under the Honours (Prevention of Abuses) Act 1925.The investigation comes after a letter was reportedly penned by Prince Charles' former valet Michael Fawcett in 2017, which came to light last year. In the letter, Michael allegedly said he was willing to help a charity donor have his CBE upgraded to a knighthood.