Prince Harry’s tell-all book will “shake the monarchy to its core”, his friends have said. The Duke of Sussex is set publicly reveal details about his relationship with the royal family in a new memoir due to be published later this year, and friends of Harry have hinted that the world can expect some explosive revelations. They told the Daily Mirror newspaper: “If they think he’s gone soft, they are mistaken. Just wait for the book to come out because that will shake the monarchy to the core.” Harry – who stepped down as a senior member of the royal family and relocated to the US alongside hi…