The Duke of Cambridge flew by helicopter to the Royal London Hospital on Wednesday morning to mark the 30th anniversary of the London Air Ambulance. Prince William has become Patron of the charity which delivers life-saving treatment across London. The Duke met with clinicians, paramedics, pilots and crewmembers to learn about the challenges of working as a first responder. Report by Jonesia. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn