The Queen's health has come into focus over the past few months following a stay in hospital, a strained back and now testing positive for coronavirus.
The man in charge of looking after her is Professor Sir Huw Thomas, Head of the Medical Household and Physician to the Queen.
Prof Sir Huw has been Head of the Medical Household since 2014 and was last year knighted after being invested with the Insignia of a Knight Commander of the Royal Victorian Order.