The Duke of Cambridge flew a critically-injured pedestrian to hospital on his final shift as an air ambulance pilot.

The woman, in her 50s, had been reported missing when she was struck by a marked police van in Hethel, about eight miles south-west of Norwich.

Officers were responding to a 999 call "relating to concerns for the safety" of the woman, Norfolk Police said.

Prince William's East Anglian Air Ambulance (EAAA) crew was called to the scene at 11.13pm on Thursday and the critical care team treated her at the scene for complex serious head injuries.