In a statement released on Tuesday, the palace said the Queen had “regretfully decided” that she will no longer travel to the Glasgow event in accordance with medical advice.
“Her Majesty is disappointed not to attend the reception,” Buckingham Palace said, adding that the Queen would instead be delivering an address at the event via a recorded video message.
The 95-year-old, who is the world’s longest-reigning monarch, stayed at London’s King Edward VII private hospital on Wednesday after undergoing “preliminary investigations” for an unspecified ailment, which was not related to Covid-19.
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It was the Queen’s first overnight hospital stay in years, but officials said she was in good spirits after the visit, with the monarch returning to light duties upon her return to Windsor Castle the next day.
Earlier on Tuesday, Buckingham Palace announced that Elizabeth had also conducted her first official engagements since her hospital stay.
The monarch’s decision to cancel plans to attend COP26 come after she was forced to cancel another planned official trip to Northern Ireland last week after her medical team suggested she rest.