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Looks more like Carex flacca but it is hard to see if it has 2 or 3 stigmas.
Just added a close-up. Does that help? I'm not hugely confident in my sedge identification skills yet...
Still cannot count stigmas, but the non-inflated utricles and black glumes support nigra. Are you sure the 2 photos are the same plant? The 2 can grow together!
I think so, but tomorrow I'll collect some more and re-post.
Thanks for your help so far
Lat/Lng: 51.0822, 0.0357
OS grid ref: TQ426334
Very approx location