Sarah Ferguson and King Charles have struck up a special bond after the King’s cancer diagnosis, a royal author has claimed. The Duchess of York issued a touching message in the wake of the monarch’s illness, telling Instagram followers “His Majesty is very dear to me”. She posted the message to mark the first event she has attended since revealing her own cancer battle. Speaking on GB News, Angela Levin told Eamonn Holmes and Ellie Costello that Fergie’s message was “lovely”. “Fergie has written to King Charles supporting him and being kind”, she said. “They’re writing letters to each other a…