London's Air Ambulance is a step closer to buying a second helicopter after the city's freemason's donated £2 million.
It means it is half way to raising the £4.4 million pounds needed.
A second aircraft would provide rapid trauma care for the capital, treating an additional 400 patients a year.
So how is the London Air Ambulance hoping to raise the rest?
Events Manager Lindsey Dixon and COO Charles Newitt explain more.