Princess Diana's engagement was oddly connected to a royal family heartbreak that would shatter the House of Windsor forever.

King Charles surprised tourists in Notting Hill with an impromptu walkabout that left onlookers ... "What a lovely, kind man," said Beau’s mother, Diana, who praised Charles’s warmth and ...

As well as King Charles and Queen Camilla ... Anne's son Peter Phillips also joined the festive walkabout with his two daughters, Savannah, who will turn 14 later this week, and Isla, 12.