The new Prime Minister Liz Truss was passed a note about the Queen's health in the Commons, leading to her looking deeply concerned.
Nadhim Zahawi, who also stood in the recent Tory leadership election, passed a note to the new PM in the House of Commons that laid bare the gravity of the current situation. MPs have rushed to share their well wishes for the monarch, 96, who is in Balmoral Castle.
A Buckingham Palace spokesperson said the Queen is "under medical supervision ".
READ MORE: BBC One suspends TV programming to cover updates of Queen's health
A Palace 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."
Members of the Royal Family, including the Duke of Cambridge and Prince Harry, have since travelled to the estate in Aberdeenshire to be with the Queen. Ms Truss met Her Majesty on Tuesday at Balmoral where she was invited to form a new government having replaced outgoing PM Boris Johnson.
Mr Zahawi, who is the Chancellor of the Duchy of Lancaster, the portfolio of land, property and assets held by the Queen, entered the chamber earlier today as a debate over energy prices continued, and took a seat next to Ms Truss.
The PM looked concerned as she read the note. It appeared Labour leader Sir Keir Starmer was also notified of the developing situation by his deputy, Angela Rayner.
It was then evident that the sombre message and tone spread through the chamber as those present bore looks of concern and worry, the Mirror reports.
Since receiving the news, Ms Truss 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."
Meanwhile Sir Keir Starmer added: "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."
There are no plans for the Prime Minister to travel to Scotland on Thursday or Friday, Downing Street has said. The Prime Minister’s official spokesman also said he could not give any updates on the Queen’s health or whether Liz Truss has been in touch with the Palace.
Downing Street also said it is not aware of any changes to business in the House of Commons on Friday. The Prime Minister’s official spokesman said this would be a matter for the Speaker.
Asked if the plan is still to go ahead with the business of the House on Friday, he said: “That’s a decision for the Speaker, fundamentally, but I’m not aware of any change.”
Meanwhile, more than 100 umbrella-clad observers have congregated on the stone steps up to The Queen Victoria Memorial, opposite the royal residence, and dozens more are standing beside the gates.
In Aberdeen, an RAF plane carrying the Duke of Cambridge, the Duke of York and the Earl and Countess of Wessex has recently landed.
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