Andy Williamson, chief executive of The Air Ambulance Service, paid tribute to pilot Pete Barnes:
We are deeply saddened to hear the news that Pete Barnes was killed in the helicopter accident in London this morning.
Pete had worked with us for many years and will be greatly missed.
Our thoughts are with his family and with all the families affected by this tragedy.
Two men were killed after a helicopter collided with a high-rise crane in London and plunged more than 700 ft to the streets below.
The pilot of the helicopter which crashed had thousands of hours of flying experience including for films such as Die Another Day.