Hey - i took their charity number off their site but I think there has been some formalisation of things, from the TAAS accounts:-
“In October 2011 we instigated talks with the Childrens Air Ambulance, a formal transfer of undertakings occurred on 1"January 2012. We also created a new identity in The Air Ambulance Service to reflect our new national chanty status, and in April 2012 effected a formal change of the charity's name.”
Although if you punch the number 1111780 into the charitycommission site (link in first post) it looks pretty grim... £563k raised, which cost £427k to get and £61k spent on charitable spending...and even that seems to be debatable when you look at the accounts ,especially since no helicopter existed at the time.
To quote the accounts prior to the "merger":-
An appropriate aircraft has been identified to service the needs of the Children's Air Ambulance service.
Research is on-going to ascertain the acquisition and fitting out of appropriate medical equipment and
furnishings.
No leasing arrangement for an aircraft has been entered into at the time of publication
It seems a grubby business.