Boris Johnson has said the Queen is “on very good form” after speaking to her this week.

The prime minister’s comments come after it was announced on Friday that the 95-year-old monarch, who pulled out of speaking at Cop26 and recently spent a night in hospital, had been advised by doctors to rest for at least another two weeks and not to undertake any official visits, prompting fears over her health.

“I spoke to her majesty and she’s on very good form,” Johnson, who speaks to the Queen every Wednesday for a weekly update, told Channel 4 News on Saturday.

“She’s just got to follow the advice of her doctors and get some rest and I think that’s the important thing. I think the whole country wishes her well.”

The Queen, who is the world’s oldest and longest-reigning monarch, has been resting at Windsor Castle since she spent a night in hospital 10 days ago for an unknown, non-Covid-related ailment and to undergo “preliminary investigations”.

In addition to the Cop26 summit, in recent weeks the Queen has cancelled visits to Northern Ireland and the Royal British Legion’s Festival of Remembrance at the Royal Albert Hall the day before Remembrance Sunday.

But Buckingham Palace said it was her “firm intention” to attend the national service of remembrance on 14 November.

A palace source said on Friday that the Queen’s medical team were taking “sensible precautions” and that she remained in “good spirits”. She is understood to have recorded her Cop26 speech on Friday afternoon to be played to delegates next week.

She had planned to host a reception for world leaders in Glasgow, which will be attended by other members of the royal family, including the Prince of Wales, the Duchess of Cornwall and the Duke and Duchess of Cambridge.