I live in Cumbria and see the RAF MRT in town quite a bit.
Usually in the supermarket buying beer.
Not entirely sure what they’re for, we already have about 8 volunteer mountain rescue teams in the Lakes.
Someone told me their main job is to secure crash sites and gather up anything dangerous or sensitive. They leave the actual rescuing stuff to the civvy MRTs and emergency services.
Probably a good gig if you like hill walking and hanging around in the lakes.
I'd guess when RAF MR started it was still early days for the civvy teams, who had nothing like the resources and abilities they have now. And a lot more aircraft being stuffed into high ground back in the 50's and 60's.