The Paddington Bears, left in memory of Queen Elizabeth II, enjoy the spoils of royal life

Paddington cast members Hugh Bonneville and Madeleine Harris – who play Mr Brown and Judy Brown respectively – along with Karen Jankel, daughter of Paddington author Michael Bond and for whom the original stories were written, will also join the picnic, which is sure to include sandwiches with jam.

Camilla, who inherited the patronage of Barnard from the late Queen in 2016, will transport the bears from the royal residences in a convoy of electric taxis driven by representatives of the London Taxis for Children charity, of which she is a patron.