That's a really interesting looking plant there. I don't know much about identifying plants, but you might want to have a go at working out what it is using this key. Hopefully one of the museum scientists will be along to tell you what sort of plant it is soon!
I was just looking at your pics. Do you think it could be the same as Jonty's plant a bit earlier in the discussion?
Hi Sorry for the delay in answering - have been off doing my own botanising in Scottish gullies! Yes, it's Angelica sylvestris as someone suggested earlier. Many damp loving meadow and open woodland species occur on our upland cliffs protected from grazing by their inaccessibility.
This is one of the commonest big umbellifers and peerhaps the only one you'd generally expect to see in this environment.
Thank you Dr Fred
A guy I showed the image to in the bothy suggested that it was Hogweed, but the leaves are different.
I will know the next time I see it.