The Queen will host a crucial meeting at Balmoral in Scotland instead of Buckingham Palace, breaking a century-old tradition and sparking fears for her health.
Boris Johnson and his successor - either Liz Truss or Rishi Sunak - will travel 1,600km to the Queen's summer residence on September 6 to facilitate the handover of Prime Ministerial power.
The Queen, 96, will ask either Truss or Sunak to form government from her Scottish castle.
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The next UK Prime Minister will be the 15th during the Queen's reign.
It is also expected that the following day there will be a virtual Privy Council meeting, with the Queen dialling in from Balmoral.
Johnson said that the handover arrangements for the UK's next Prime Minister 'will fit totally around' the Queen.
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"I don't talk about my conversations with the Queen, no prime minister ever does," he said, as per the Daily Mail.
"But I can tell you that we will certainly make sure that the arrangements for the handover will fit totally around her and whatever she wants."
Former BBC royal correspondent Peter Hunt said the Queen not being well enough to travel serves as another reminder of 'her advanced age and increasing frailty'.
"Despite this, the Queen remains determined to carry out her core duties," he said, per the Daily Mail.
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"Appointing a new prime minister is not something that can easily be passed to Prince Charles, a king-in-waiting."
The Queen's ailing health has been of growing concern since the death of her husband Prince Phillip last April.
She pulled out of the Remembrance Day service in November due to a sprained back and missed several events of the Platinum Jubilee after she felt ‘some discomfort' during the 2022 Trooping the Colour celebrations.
She was also spotted at the Chelsea Flower Show in a buggy as she struggles to walk.
To make matters worse, the 96-year-old monarch caught Covid-19 at the start of the year.
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The new UK Prime Minister will be announced on September 5 and it will be the first time that a new leader has been appointed away from Buckingham Palace during the Queen's 70-year reign and the first since 1908.
Back in 1908, King Edward VII asked Herbert Asquith to travel to the south-west France of where he was on holiday.
Prime Ministers during Queen Victoria's reign were regularly requested to visit her in Balmoral.
Featured Image Credit: PA Images / AlamyTopics: The Queen, Royal Family, News, UK News