DX
You might investigate joining the Royal Auxiliary Air Force - they have a medical wing, and have people who are trained to aeromedical qualification. They fly all over the place on RAF aircraft on Casualty evacuation (CASEVAC) trips, accompanying seriously sick or injured personnel.
The RAF website is worth a good browse:
http://www.raf.mod.uk/rafhome.html
Recruiting Offices at:
http://www.raf-careers.com/html/goforit/afco.html