The Wilderness Medical Society is the world's largest recognised organisation that offers medical training for remote and austere environments. There are plenty of institutes who offer wild med training here in the UK and Ireland.
For international recognition the one to look into is the Australian Registry of EMTs. (AREMT).
EMTs are not recognised here in the UK but they are in Ireland.
Certification and recognition are highly important when looking into medical training. What good is all of that high speed, cool guy, stuff worth if you can not use it on anyone besides your family? With certification with a recognised organisation you can have that support.
I found that out the hard way which is why I raised it. I did have a City and Guilds and the Diploma in Emergency and Primary Health Care off the back of my job and a fair bit of training including BATLS from over here and Advanced Tactical practitioner in the US. But nothing that was recognised to allow me to be a medic on expeditions. For that I had to go the US for a month (To get arguably a lower standard of training) for the Wilderness EMT qualification they all seemed to want. I couldn't find recognised Wilderness EMT training here when I looked so that link is a big plus as, on the whole, I prefer Guiness to the frozen gnats wee they call Beer over there.