Maybe the fundraisers would like to send the money direct to MoD since the SARForce already provides this service 24/7 around the UK. I have done more hospital transfers than I can shake a stick at and many of those were for sick children. The NHS just has to make a case to ARCCK that the medical condition of the patient requires helicopter transfer.
Apart from the 139s at Portland and Lee, all the SAR aircraft are large and can transport a full medical team with incubators, ventilators, monitors etc etc in relative comfort - the S-92 has its own oxygen system as well.
So why should anyone think there is a need for a dedicated Children's AA? A waste of time and money that could be used supporting normal AAs.
Oh and just for chopjock - I did one last year from Bude to Bristol at night in 50 gusting 60 kts - fancy that in an R44 or other light single?