Dial 999 at Heathrow airport and you can expect to be treated by a paramedic on a push bike loaded with life saving equipment.

Bikes are the quickest way to get to a casualty through a crowded passenger terminal according to the London Ambulance Service and the team now operates across all five terminals.

Paramedic Guy Dunk explains how the service works and rushes to the aid of a young passenger who has fallen sick just before boarding a plane.