As the royals gathered in Balmoral for their annual summer trip to Scotland, there was only one thing on the discussion list – the then-imminent return of the wayward Duke and Duchess of Sussex.

With King Charles, Prince William and Kate Middleton all in one place for some downtime, I’m told that the surprise (and urgent) summit led to them coming up with an interesting – and potentially explosive – idea between them: the possibility of having a face-to-face meeting with Prince Harry.

My source tells me, ‘William is extremely concerned about what Harry’s return to Britain will mean for working members of the family. It may well be too risky for them to just sit back and let Harry make the next move.’

‘There are suggestions that they feel they have no choice but to ask the Duke of Sussex for a face-to-face meeting to discuss the future and lay down, or at least reiterate, some of the rules.

‘Whether Harry will agree to meeting them all is up for debate, but it is felt that the King and William have little option but to try.’

I’m told that William feels he has been pushed into a corner and is now in a position where he has to invite his brother to talk about what’s next, similar to the meeting Queen Elizabeth II organised at Sandringham in January 2020.

Cast your mind back and you will remember that Harry was told in no uncertain terms that not only could he and Meghan no longer use their HRH titles, but they could not expect to be half-in, half-out members of the family.

Arguably, they have flouted both conditions, with their titles still used on paperwork, and the pseudo-royal tours they have often made headlines with.

Effectively, the late Queen saw the dangers of Harry quitting life as a full-time working royal, yet still cherry-picking causes he could still promote without consulting the Firm.

Now that the Sussexes are back in Blighty, it’s likely that King Charles and his heir will have major concerns about what exactly they are planning going forward. The damage they inflicted on the family from thousands of miles away was bad enough, but courtiers have warned that with them on home soil the dangers are far greater.

While a meeting may well be useful in rebuilding some kind of relationship between William and Harry, it would be fraught with risks.

If it goes badly, there is a real possibility that the Duke of Sussex may turn to his trusted media to reveal secret details about what went on, something I’m told understandably really worries William. Any meeting between the royal brothers is likely to be at the very least frosty, and at worst a full-on confrontation.

William remains angry with his brother for the string of high-profile interviews and a book that betrayed the family and the very institution that sought to protect him. In an ideal world, William would be able to use the meeting as a way of airing his disappointment, and get assurances from Harry that the days of dropping bombshells on the family are over.

For his part, Harry would benefit from building bridges with William, not least because of what revenge he could and may likely take once he becomes King.

My source added, ‘Harry may be many things but he is not stupid. He knows that if he remains at war with his brother, when the time comes for William to take the throne the consequences for him could be severe.’

Some royal watchers have claimed that William may well strip his brother of the title of Prince when he becomes King, in the same way his father stripped Andrew Mountbatten-Windsor of his title. This would be a bitter blow for Harry and would surely hamper any efforts to make money out of his association with the Royal Family.

Then there is the issue of the Sussex children. Prince Archie and Princess Lilibet could become the innocent victims of any move by William to disassociate himself from his brother.

However, the fact still remains that the Sussexes’ surprise move back to the UK has blindsided the family, and I understand they have real concerns about why the pair have made this move after making it clear how they felt about leaving.

Prince Harry is still involved with charity WellChild, of which he is patron, and next year he will hold his Invictus Games, for wounded servicemen and women, in Birmingham. These are both high-profile organisations that will deflect attention from the day-to-day work of the Prince and Princess of Wales.

William and Kate simply cannot risk Harry and Meghan being loose cannons, able to pick and choose engagements with impunity as if they were working royals in all but name.

And while the move back to the UK perhaps makes sense for Harry and his children, what about Meghan? After all, if she is to be believed, she was living her best life in the city where she grew up – so why the sudden change?

Either way, there is no doubt that with this surprise return, Harry could be forcing the hand of William, who hasn’t spoken to his brother for a very long time, but may now. I predict interesting times ahead.