You will find that Lucy is the acceptable side of 'other' ambulances.
They too 'rob' the mainstream operations in cross border fundraising raids but they do serve a different task to such as the Children's Air Ambulance [TCAA]. TCAA claims to cover the whole of England and Wales as a children's AA to the exclusion of all others and the mainstream dispute that activity.
Lucy raises funds to pay for the carriage of children by other air ambulance operators [rotary or fixed wing, whichever is most appropriate].
They are associate members of the AAA as a result.