The Trust clearly has the money to fund a second aircraft. It has over the years built up a sizeable income through raising its profile and fantastic fundraising. You can't go into a shop in Cornwall without seeing one of their charity boxes by the till. The people of Cornwall are very proud of their Air Ambulance and are prepared to fund it.
The new HQ at Newquay is also very efficient by having the aircraft co-located with the Charity, which means corporate sponsors can get the tour and then be persuaded to put their hands in their pockets.
Also, and I quote, having visited last year, the hangar was designed to accommodate 2 EC145 size aircraft.
Best of luck to them I say. And don't forget - probably at least 3 more pilot jobs being created!