The Duke of Edinburgh has spent a third night in hospital in London being treated for a “pre-existing condition”.
The Queen is at the Sandringham Estate in Norfolk, where she attended a carol service without 98-year-old Prince Philip on Sunday.
He remains at the King Edward VII’s Hospital in central London, having travelled there on Friday as a “precautionary measure”.
Buckingham Palace said the admission was for “observation and treatment”.
The duke went to hospital on the advice of his doctor, it said in a statement.
It refused to confirm or deny reports the duke was flown to London by helicopter and then driven by car for the last part of the journey.
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