A Buckingham Palace spokesman said: “This means that the Privy Council meeting which was due to take place this afternoon will be rescheduled.” “After a busy day yesterday, His Majesty this afternoon took the doctors’ advice to rest.” The Queen meets Liz Truss at Balmoral on Tuesday (Getty) The monarch, 96, has ongoing mobility problems and was due to hold the Privy Council meeting effectively on Wednesday. During the process, Mrs Truss would have been sworn in as First Lord of the Treasury and the new ministers would have been sworn into their roles and also become privy councilors if they had not already been appointed as ministers before. Doctors have advised against a hospital stay and the Queen remains at Balmoral Castle, where she has appointed Ms Truss, the 15th Prime Minister of her reign. Mr Johnson also met the Queen at her retreat in Scotland to tender his resignation, three years after she appointed him prime minister. Her Majesty’s health has come under scrutiny over the past year, with her having to pull out of key events due to “episodic mobility problems”. In October 2021, she used a cane at a service at Westminster Abbey – the first time she had done so at a major engagement. A week later, after a busy autumn schedule, her doctors ordered her to rest and advised her to cancel a trip to Northern Ireland. The Queen was secretly admitted to hospital for “preliminary investigations” and had her first overnight stay in hospital for eight years on 20 October 2021. The Queen joined members of the royal family on the Buckingham balcony in 2019 (PA) For more than three months he performed only light duties, including mock and face-to-face audiences in the confines of Windsor Castle. She waved to crowds from the balcony of Buckingham Palace on the first day of her Platinum Jubilee celebrations on June 2, and later appeared at Windsor Castle. But the next day he pulled out of the Platinum Jubilee Mass of Thanksgiving at St Paul’s Cathedral after experiencing “discomfort” during the previous day’s celebrations. In March, it was reported that the Queen would not be returning to live at Buckingham Palace but would continue to reside permanently at Windsor Castle.