King Charles’ coronation: Will Sussexes Prince Harry and Meghan …

Royal insiders say they are still "none the wiser" as to whether Harry and Meghan plan to attend the Coronation, despite the deadline for RSVPs having closed on Monday.

Sources have said the April 3 cut-off date has passed and staff have still not been told whether the King's estranged son and his wife are accepting his invitation to attend, even though the event is just a month away.

The issue is causing a "headache" for organisers, who are trying to finalise issues such as seating arrangements, cars, and security for the coronation on May 6.

Buckingham Palace declined to comment but an aide said it was unlikely there would be a strict cut-off date for family members as there would be for other guests.

"Everything is still up in the air and there's only a month to go. All people have been told is that it should hopefully be resolved soon," a source said.

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"But in the meantime, the teams are trying to finalise plans for 2000 guests, many of whom are international heads of state and VIPs.

It's a headache."

The Daily Mail first revealed last year that Charles would be inviting the Duke and Duchess of Sussex to his coronation, despite the many brickbats they have thrown at the King, his wife, and his wider family.

The Sussexes later confirmed they had received an invitation by email.

Relations are so bad that the King and Prince William have not spoken to the couple for several months.

One newspaper sympathetic to the Sussexes reported yesterday that they had been in "email correspondence" with the palace recently but said Harry was in a "predicament" about whether to attend.

The prince has previously demanded that his family apologise to him and Meghan over how they were allegedly treated and said he would need to sit down and talk to his father and brother if they were to consider coming.

The Mail subsequently revealed, however, that the King and his eldest son are in no mood to "pander" to his demands.

Despite the awkwardness that would ensue if Harry or Meghan were to attend, the King is understood to be determined to do the right thing and invite his younger son.

A game of transatlantic "ping pong" has apparently been going on for weeks about arrangements for whether the Sussexes will attend.

Buckingham Palace staff have been ordered to plan as if they were coming, suggesting it wasn't a definite and immediate "no".