good afternoon and welcome to the bbc news at one. afterfour weeks in hospital, the duke of edinburgh has been discharged and has returned to windsor castle. prince philip was admitted to king edward vii s hospital in central london on february 16th after feeling unwell. the duke, who s 99, later underwent a successful procedure for a pre existing heart condition at another london hospital. our royal correspondent nicholas witchell reports. shielded by a screen, a patient, evidently in a wheelchair, was brought out from the king edward vii hospital to a waiting vehicle. moments later, the vehicle left with the duke of edinburgh safely aboard, on his way home to windsor after his longest hospital stay, 28 nights in total, four of them at st bartholomew s hospital for specialist heart treatment. as the car left, photographers caught sight of the duke sitting in the rear of the vehicle. little has been said by the vehicle. little has been said by the palace about the reasons for