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The Duke and Duchess of Sussex landed at Birmingham Airport on Wednesday

Prince William and Prince Harry may come together again when the 30th anniversary of Princess Diana's death arrives on August 31, 2027, royal author Robert Jobson has predicted.

The brothers are understood to have had no contact for approximately two years.

Mr Jobson described the upcoming milestone as one that will carry considerable weight.

"The 30th anniversary is going to be quite significant, I think," he said.

He suggested the occasion would make a continued estrangement untenable, asking: "How can they not be together? They have to be on the same stage."

Diana, Princess of Wales was 36 when she died in a Paris car crash in 1997. Her brother, Earl Charles Spencer, recently announced that he is releasing a memoir entitled Swan Song in her honour.

Mr Jobson told Hello! that Harry, now 41, has been actively seeking to position himself as the custodian of his mother's legacy.

He pointed to the Duke of Sussex's visit to Angola and his continued involvement in landmine clearance work as evidence of this effort.

"There's going to be a moment where there has to be some form of arrangement for the 30th anniversary of Diana's death," Mr Jobson said. He went on to warn that Harry's pursuit of this role is likely to cause friction with his elder brother.

"I think that we're going to see more of Harry trying to take over the ownership of Diana's legacy, which is bound to irritate his brother," the royal commentator added. William, 44, has long maintained his own connection to their mother's charitable causes.

The Duke and Duchess of Sussex landed at Birmingham Airport on Wednesday, following reports last week that they were planning an "extended stay" in Britain.

Their children, Prince Archie, seven, and Princess Lilibet, five, are set to enrol in British schools when the new term begins in September. Harry is expected to press on with his charity work, whilst Meghan will continue developing her As Ever brand.

Commenting on how the Prince of Wales likely received the news, Mr Jobson claimed William must "be feeling slightly aghast." It is understood the heir to the throne was with King Charles at Balmoral Castle in Scotland when the Sussexes' return was publicly confirmed.

"The prodigal son coming back will be difficult for him," Mr Jobson observed. "Harry's move puts pressure on him to act in a more pragmatic way."

The King was photographed for the first time since his younger son's arrival when he was spotted behind the wheel of his Range Rover at Balmoral on Thursday.

Charles was dressed in a checked shirt and beige overcoat as he drove through the Aberdeenshire estate, while the Sussexes were settling into their new home elsewhere in the country.

The monarch is expected to remain at his Scottish retreat for the time being, though he has engagements drawing him south in the coming days.

He is due back in the capital next week for a reception with the Pakistan Cricket team at Clarence House.

Whether any meeting between the King and his son Harry will take place during this period remains unclear.