Harry and Meghan's commercial status is at a turning point in America, say Hollywood insiders – who warn that the couple's celebrity status is starting to wilt.

Prince Harry's belated announcement that he is coming to his father's Coronation next month was warmly welcomed in Los Angeles – not least because the Sussexes' currency depends on him still being seen as an active member of the Royal Family.

'Harry is going back for all the right reasons but there was a palpable sigh of relief among those of us involved in the business because Brand Sussex relies on Harry being seen with his family,' a Netflix source said.

'At the end of the day it is all about proximity to the King.'

Harry, fifth in line to the throne, is expected to attend only the Coronation ceremony at Westminster Abbey on the morning of May 6 before heading back to California.