Prince Philip, 99, has been moved to a different hospital to continue his treatment for an infection.
The Duke of Edinburgh was transferred from King Edward VII’s Hospital in London to the nearby St Bartholomew’s Hospital.
The Duke was first admitted to hospital nearly two weeks ago.
He was driven there and walked in unaided.
A statement then said the Duke was feeling unwell and hospital was a “precautionary measure”.
However, he was taken by ambulance today to St Barts.
A Buckingham Palace statement said:
“The Duke of Edinburgh was today transferred from King Edward VII’s Hospital to St Bartholomew’s Hospital where doctors will continue to treat him for an infection, as well as undertake testing and observation for a pre-existing heart condition.
“The Duke remains comfortable and is responding to treatment but is expected to remain in hospital until at least the end of the week.”