|Wow there is a lot here. A good base story with kits of description. I can see where you are going and your commitment to showing and not just telling. A few comments.
First, I feel your paragraphs are too long. Paragraphs should convey thoughts or thoughts around thoughts. Think the Bible. Not many long paragraphs in that book, but all very descriptive and meaningful. I enjoy the detail you are building, but if you don't break apart the thoughts like bites of a sandwich, I have trouble eating the whole thing at once.
Rick's now crippled hand. From what? An accident? Holding his bag too long in the cold? When I read that sentence, my mind went to at least middle age, then just a little later you said he was 28. Now I am curious about the crippled hand. If there is more to it, and I think there there should be, it would help build out your narrative of who this man is and why he is here. If the crippled hand does not add to the story, consider deleting it.
Did Rick plan this trip, or did he just meet some people in a bar killing some time and decided to hike? Did he want to hike and was attracted by the group's discussion about hiking? Some detail here would be good and it would help build your backstory.
Read carefully to avoid being over-descriptive. When you introduce the group you mention the couple from the UK, and then you say it immediately again:
"They had a young couple from the UK, an eccentric local photographer, an Australian girl and their local climb leader.
Rick saw Mary and Thomas, a young couple from London, were crouched packing their matching bags."
Some editing would help here. Why not just say London or Londoners, as everyone knows London is in the UK? I make this point to show you a potential distraction, as with reading distraction often leads to confusion. Write as tightly as possible. As in your comment about Barclays - delete "in England."
My last point - why does Rick of all people stay behind? Was this his trip to reward himself? Wasn't he excited? I had to reread a few times to understand that it was him who stayed behind, and I have no idea why. I would consider having another character stay behind in the tent. I have climbed and unless someone was severely hurt or injured, or I had been on that mountain before, i would be the lass person to stay behind and miss the adventure!
You have a very good story started here. It does not need to go on a diet, but a workout plan. Build out some areas to add some character and plot depth and cut some redundancy. Again, this is a good start, and the twist at the end with the stuffed animals took me completely by surprise. I would love to red another version!