Rosamund attended the ceremony at Buckingham Place with members of her close family.
Speaking from the Palace, Rosamund said:
“It was a very poignant day. Ella’s siblings and I were incredibly touched that King Charles knew about Ella’s story and the work that the Ella Roberta Foundation has been doing to raise awareness about air pollution and its threat to human health. We agreed that I will write to him to see where he can support us further. It was an honour of a lifetime to visit Buckingham Palace, it has bolstered my drive to keep going with my campaigning to ensure every child has a right to breathe clean air.”