Hi
I can;t think of anything that would fit that kind of title. I would think most people interested in outdoor activities in the UK would see themselves as walkers, climbers etc and not interested in Survival per se. So there are organisations which represent and provide training etc for the relevant activities. Locally there are likely to be walking clubs, climbing clubs etc. I guess there's also Outward Bound which provides activity based holidays, team building etc.
There are a number of compaines which run survival type courses and there's even a bushcraft weekend in the Autumn which brings together a number of these compaines.


There'a also exploration or adventure travel clubs, such as the Royal Geogrpahical Society but I don't know much about them.
Justin