- Video report by ITV News correspondent Geraint Vincent
The Duke of Edinburgh has been suffering from a problem with his hip for the last month.
On Wednesday he will undergo an operation to have it fixed.
He was driven to King Edward VII hospital in central London on Tuesday from Windsor Castle where he’s been for the last few weeks.
He was not rushed in by ambulance.
It is the same hip problem which forced him to miss three engagements recently, including the Easter Sunday service at St George’s Chapel - which the Queen attended alone.
Royal aides won’t be drawn on the type of operation he will undergo. Nor whether he’s going to have a full hip replacement.
The Duke is 96 but it would be wrong to rule out a hip replacement because of his age.
The Queen Mother underwent hip replacements at age 95 and 98. She spent nearly three weeks in hospital after the first operation.
Prince Philip was last at the King Edward VII in June of last year when he suffered from what was understood to be a bladder infection.
Buckingham Palace will not comment on how long he is expected to be in hospital.
Unless there is any change in his condition, they will issue no further guidance on Tuesday night.