The Queen, who is following medical advice to take it easy for two weeks, donned a headscarf and sunglasses as she got behind the wheel to drive herself around her estate at Windsor on Monday.
Forced to cancel her appearance at Cop26 in Glasgow after a recent overnight stay in hospital for tests, she was seen alone in the green Jaguar estate that she usually uses to take her dogs to go for a walk.
Though she is complying with her doctors’ advice to cancel all official visits, she is still undertaking light duties from Windsor Castle.
It was announced on Friday that she would not be attending the Royal British Legion festival of remembrance on the evening of 13 November, but her “firm intention” was still to attend a Remembrance Day service at the Cenotaph the following day.
Buckingham Palace has previously said the 95-year-old monarch is in “good spirits”. It has given no details of any specific medical issues.
She cancelled a two-day visit to Northern Ireland on the day she attended King Edward VII hospital in central London. On Friday the palace said she would rest for “at least” another two weeks.
Boris Johnson said at the weekend that the Queen was “on very good form”.
Her hospital admission for “preliminary investigations” followed a busy schedule including visits to Scotland and Wales. She has been undertaking virtual engagements by video link from Windsor Castle since.
Though unable to attend Cop26, she has recorded a video message for delegates, while Prince Charles, the Duchess of Cornwall and the Duke and Duchess of Cambridge will attend a reception for world leaders.