Royal experts warn the Sussexes’ return could overshadow King Charles as he battles cancer, while William reportedly sees the move as another unwanted headache

The monarch is said to have only been informed on Sunday about the Sussexes' return to British soil this month.

The Duke and Duchess of Sussex are understood to be returning for an 'extended period' of time, with Archie, seven, and five-year-old Lilibet starting at a British school in…