A Palace spokesman 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.”
The Queen is currently isolating at Windsor Castle and is not expected to visit her husband in hospital.
Prince Charles, 72, is so far the only Royal Family member to have paid Prince Philip a visit.