The Queen’s diary will be “carefully examined” to Christmas and beyond, after she was ordered by doctors to take a period of rest, the Mirror understands.

Courtiers have been instructed to take a “careful and cautious approach” when outlining the Queen’s diary in future, royal sources have revealed.

The 95-year-old monarch this week pulled out of the COP26 United Nations climate change summit, less than a week after spending a night in hospital.

Buckingham Palace said Her Majesty “regretfully decided” not to travel to Glasgow and will now stay at Windsor Castle where she will rest on doctors’ orders but undertake “light duties”.

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Her Majesty held a virtual audience with the Ambassador from the Swiss Confederation, also on Tuesday (

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PA)

Results or indeed the reasoning behind the head-of-state’s “preliminary investigations”, carried out last week by specialist doctors at the King Edward VII hospital in Marylebone, London, have not been made public.

Palace officials will look to create engagements for the Queen judged on how she is feeling and whether there are large travel implications, which was largely behind her decision not to attend the climate summit next Monday.

It is understood there will be “even greater collaboration” between the senior members of the royal family to accompany the Queen on future engagements.

The Queen has kept busy of late, despite her age (

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POOL/AFP via Getty Images)

Princess Anne was with her mother earlier this month at a Westminster Abbey service as the Royal British Legion marked its centenary.

The event was the first time the Queen was seen using a cane in public.

Buckingham Palace did not comment but a royal source said: “The senior royals as a unit have collectively discussed a greater need for collaboration in their projects together, whether that is explicitly working on the same topic or supporting each other on an ad-hoc basis, different plans will be drawn up to the ones that currently exist.

“After the coronavirus restrictions have ended they all feel the need to get out and do more.

“The Queen is aware of the need to rest and that is what she is doing now.

“No doubt she will be back when she feels ready.”

Meanwhile, The Prince of Wales will deliver the opening address at the Cop26 UN climate change summit, Clarence House has announced.

The Prince of Wales will step up in Her Majesty's absence (

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PA)

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Charles, who delivered the opening speech at Cop21 in Paris in 2015, will speak to delegates gathered in Glasgow for the opening ceremony on Monday hosted by Prime Minister Boris Johnson.

During the day, a series of royal events in support of Cop26 will be staged, while Charles, the Duchess of Cornwall and the Duke and Duchess of Cambridge will join an evening reception the Queen will now not attend as she continues to rest.

Charles will also co-host the Great Green Wall session, alongside French President Emmanuel Macron and his Mauritanian counterpart Mohamed Ould Abdel Aziz.

William and Kate will join Charles to host a reception for key members of his Sustainable Markets Initiative and winners and finalists from William’s environmental Earthshot Prize Awards.

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