The Prince of Wales is set to earn an eye-watering £20m salary next year as he is now entitled to a private income generated from the Duchy of Cornwall landed estate, following the death of his grandmother, the late Queen.The 41 year old heir to the throne, following his father the King's accession, earned £6m this year but faced criticism for not publishing an annual report in his first year as the next in line to be king. Since inheriting the Duchy land Prince William will now benefit financially from its surplus profits every year.