the travel was done under normal tourism procedures-eg MOD are not notified of these clubs non uk activities.
I am still a member of the The Royal Signals mountaineering club as well as other outdoor activities. The army has no resonsibility over these clubs/associations as they include serving/ex serving members and civilians who are professional trainers or experts invited to take part.

You should read a book by Hugh McManners "Crowning the dragon" and published by Grafton- the story of a ten man British army expedition to the 3rd highest unclimbed peak inthe Chinese Karakoram.
great book

External army activities/hobbies mean paying your own way