Stems 2-2.5cm. Hair-like leaves 5mm, less than 1mm wide at base with brownish tip, no obvious nerve and no obvious teeth on leaves
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You could be right, as this species is very widespread. However, I'm not confident enough on the basis of that photo to agree. Have you considered Campylopus flexuosus?
Yes, I did consider it, but wasn't sure. I'll have another look and see
I can see brown areas on the corners of the leaf bases. Is that a particularly defining feature?
That's what the books mention! Can you tell how large a proportion of the width of the leaf base is nerve? That's another key feature, but I've never found it easy to be sure myself.
At first sight I didn't see a nerve at all, but that's because it is almost the entire width of the leaf, and it is only at the base that you can distinguish leaf and nerve, where the nerve is maybe 70% of the width, possibly more.
That definitely points at the Campylopus!
Lat/Lng: 50.4939, -3.943
OS grid ref: SX622678