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... for the oversight of not giving an indication of scale - the leaves are about 6 inches long.
I'm sure that it's not Deschampsia cespitosa, which I do know.
I've seen this plant (at least what I think is the same species) a few times, but I've found it to be shy-flowering.
Lat/Lng: 53.07084, -2.24538
OS grid ref: SJ836526