Try this:
http://www.charitycommission.gov.uk/..._ambulance.pdf
Charities Commission are watching them closely after 'reminding them how to run a charity properly'.
In my personal opinion, it would seem they are are a bit short in the "due diligence" department and also in the aviation side of things. Not enough research done to make this a viable option.
Currently they are barely keeping their financial heads above water in that a vast proportion of their intake is being spent on salaries and expenses???