The Queen has cancelled a visit to Northern Ireland based on medical advice.
The 95-year-old monarch was scheduled to begin a two-day trip to Northern Ireland today.
A Buckingham Palace spokesman has revealed the visit will not happen, as The Queen has "reluctantly accepted medical advice to rest for the next few days."
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He said: "Her Majesty is in good spirits and is disappointed that she will no longer be able to visit Northern Ireland, where she had been due to undertake a series of engagements today and tomorrow.
"The Queen sends her warmest good wishes to the people of Northern Ireland and looks forward to visiting in the future."
Queen Elizabeth II's decision is understood not to be related to coronavirus.
Buckingham Palace would not comment on whether the head of state had received her booster Covid-19 jab, but given her age it is likely she has already had it.
The nation's longest reigning monarch is resting at Windsor Castle.
The Queen has had a busy programme and hosted a major global investment summit at Windsor Castle on Tuesday evening.
She is still expected at this stage to attend events linked to the Cop26 climate change conference in Glasgow at the end of the month.
On Tuesday, it was revealed the Queen had turned down the Oldie of the Year trophy because she feels she does not meet the criteria, believing "you are only as old as you feel".
The Queen, who is just five years away from her 100th birthday, is due to celebrate her Platinum Jubilee - 70 years on the throne - next year.
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