The Duke and Duchess of Sussex will be in Africa around the same time that Harry is expected in London for an event to mark 10 years of the Invictus Games.
King Charles attended services at St. Mary Magdalene Church, near where he was recuperating following his first treatment for an unspecified form of cancer, with Queen Camilla.
A court has ruled in favor of Prince Harry, awarding him about $180,000, in a phone hacking case that saw him become the most senior royal to ever take the stand in the U.K.
Prince Harry's lawyers say the impact on Britain of any successful attack on the young royal mean he should get full police protection when he visits.