The Queen has been put under medical supervision after doctors voiced concerned for Her Majesty's health, it has been confirmed.
Prince Charles, Camilla and Prince William have rushed to Balmoral to be by her side while other members of the royal family have been informed. Buckingham Palace issued a rare statement on the Queen's health today to say that she remains comfortable and is staying at Balmoral.
The news follows months of growing concern for the 96-year-old's health which has seen her pull out of several official and private engagements. The statement said: "Following further evaluation this morning, The Queen’s doctors are concerned for Her Majesty’s health and have recommended she remain under medical supervision.
"The Queen remains comfortable and at Balmoral."
Prince Charles' helicopter was seen landing at Balmoral this morning and it's understood that William is flying from Windsor to be with his grandmother.
William travelled to Scotland on the same plane as Prince Andrew, Prince Edward and his wife Sophie Wessex and shortly after were seen arriving at the estate.
Camilla has cancelled an engagement in Lanarkshire to travel to the estate while Princess Anne has arrived from elsewhere in Scotland.
Prince Harry and Meghan Markle were due to attend the WellChild Awards ceremony in London on Thursday evening, but have changed their plans.
Harry is now travelling to Balmoral but is making the trip separately from the other royals and he has been in co-ordination with other family members' plans.
Meghan could potentially join Harry in Scotland at a later date, a source said, following the change of plan but now remaining in London.
The Duchess of Cambridge has not joined her husband at Balmoral as today marks Prince George, Princess Charlotte and Prince Louis's first day at their new school following the family move to Windsor.
It comes just days after the Queen met with Liz Truss to officially appoint her as the new Prime Minister.
She was on the front bench of the Commons after her first major policy intervention as PM when she received the concerning news about the Queen’s health.
The initial indication that something was wrong came as Chancellor of the Duchy of Lancaster, Nadhim Zahawi, came into the Chamber, sat down next to the Prime Minister and began urgently speaking to her while she was listening to Labour leader Sir Keir Starmer’s response to her energy statement.
Ms Truss sent a message on Twitter and said: The whole country will be deeply concerned by the news from Buckingham Palace this lunchtime. My thoughts - and the thoughts of people across our United Kingdom - are with Her Majesty The Queen and her family at this time."
The nation’s longest-reigning monarch has ongoing mobility issues and looked bright but frail and used a walking stick during Tuesday’s historic audience with Ms Truss, which followed a visit from outgoing prime minister Boris Johnson as he tendered his resignation.
Speaker Lindsay Hoyle said to MPs: "We send our best wish to HM the Queen and that she and the Royal Family are in our thoughts and prayers at this moment."
Meanwhile, Labour leader Sir Keir Starmer said he is “deeply worried” by the news from Buckingham Palace and he is hoping for the Queen’s recovery.
He tweeted: “Along with the rest of the country, I am deeply worried by the news from Buckingham Palace this afternoon.
“My thoughts are with Her Majesty the Queen and her family at this time, and I join everyone across the United Kingdom in hoping for her recovery.”
Former Conservative prime minister David Cameron said he was "deeply concerned" by the news about the Queen's health.
"Deeply concerned by the news this afternoon from Buckingham Palace," he tweeted.
"I send my heartfelt thoughts and prayers to Her Majesty The Queen and the Royal Family at this worrying time."
And former Labour prime minister Sir Tony Blair said he is “deeply concerned” by the news about the Queen’s health.
“It is deeply concerning to hear today’s news from Buckingham Palace,” Sir Tony said in a statement posted to Twitter.
“My thoughts and prayers are with Her Majesty the Queen and her family at this worrying time.”
The Archbishop of Canterbury has also said the “prayers of the nation” are with the Queen.
“My prayers, and the prayers of people across the (Church of England) and the nation, are with Her Majesty The Queen today,” Justin Welby tweeted.
“May God’s presence strengthen and comfort Her Majesty, her family, and those who are caring for her at Balmoral.”
The monarch, 96, has ongoing mobility issues and had been due to hold a Privy Council meeting virtually yesterday but it was postponed.
During the proceedings, Ms Truss would have taken her oath as First Lord of the Treasury and new cabinet ministers would have been sworn into their roles, and also made privy counsellors if not already appointed as one in past.
A Palace spokesman said yesterday: “After a full day yesterday, Her Majesty has this afternoon accepted doctors’ advice to rest.
“This means that the Privy Council meeting that had been due to take place this evening will be rearranged.”
The Queen thrilled crowds on the first day of her Platinum Jubilee celebrations on June 2 when she appeared on the Buckingham Palace balcony and later at Windsor Castle.
But the next day she pulled out of the Platinum Jubilee Service of Thanksgiving at St Paul’s Cathedral after experiencing “discomfort” during the previous day’s celebrations.
The decision was considered regrettable, it is understood, but sensible due to the length of the journey and time involved and the physical demands the event would have required.