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Is it possible to get this to species level from the pictures here?
... means that it's not Eriophorum vaginatum. That leaves three species, but Eriophorum angustifolium is the commonest by a wide margin.
It doesn't appear to have bristles on the spikelet stalk, and doesn't appear to have a distinctly 3-angled stem, both of which would make it Eriophorum angustifolium, but I'm not sure that those characters can be reliably evaluated from these photographs.
I've added a couple more detailed pictures of the stalk in case that helps. But I suspect this one will have to remain at genus level.
Lat/Lng: 60.4, -1.4
OS grid ref: HU3573