Having just about sorted the retraction issue there is another problem.
EASA is mandating the certification of the medical oxygen system and bottles. Some pre-certified [i.e. Bucher in the H145] but others including the forthcoming UK AW169 fleet from SAS are in the process of certification of the modified Air Methods system. May take a while.
EASA has decided that 'carry on' is not the way to go forward and this has also started to affect HEMS in the USA..... where EASA leads...