Roger Lundgren, a swedish expert on the European royal families, shared at his Instagram a letter from Camilla
"For many years I have been proud to call Camilla, the Duchess of Cornwall a personal friend. We have been exchanging letters since the 90's and also met at her home in Clarence House in London. Here I share with you the nice letter she wrote to me after I condoled with her after Prince Philip's death (took time due to my broken hand). I have also met Philip - not bad of a Norsjö boy from Granvägen when you think about it. What book did I send !? Yes - Hon kallades Daisy/She was called Daisy by Princess Christina, a fantastic book about the King's grandmother and think, she grew up in Clarence House!"