In reply......
There was (is) an excellent documentary on YouTube about Whymper's first ascent, called Tatort Matterhorn (Crimescene Matterhorn) which, as a docudrama really captures the era (tweed coats 'n' all) very well.
Maybe worth a watch before listening to radio 4, LOL.
However, it's all in German, but I can speak a word or two so that was ok for me. Maybe not for others.
Anyway, link is......