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There is a form of Soft Rush with compact heads which it might possibly be. You need to check the number of ridges on the stem.
Thanks - I will have a look next time I see this group of rushes. Methinks I might need a more expert book to aid my identifications.
Lat/Lng: 54.8933, -2.08392
OS grid ref: NY947553
Growing beside a stream in a woodland glade.