King's pledge of service defines UK's modern monarchy

Britain's Prince Louis eats toasted marshmallows as they take part in the Big Help Out, during a visit to the 3rd Upton Scouts Hut in Slough, England, Monday, May 8, 2023. People across Britain were on Monday asked to do their duty as the celebrations for King Charles III's coronation drew to a close with a massive volunteering drive. (Daniel Leal/Pool Photo via AP)