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Length of shoots up to 10cm long and leaves about 4mm would indicate this species, if leaf base runs down onto the stem. It grows near streams and in marshes.
It presumably is a Plagiomnium, but i reckon it could equally be P affine. Isn't P affine a more common moss too?
This area is absolutely dripping in mosses of all sorts so there is probably a mixture of common and rarer species.
Lat/Lng: 51.223364, -3.928619
OS grid ref: SS654488