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I'm not sure what size it is, but it looks more like Sphaerium s. lat. rather than Pisidium, and nor am I sure whether the name pea mussel applies only to Pisidium or to Sphaerium too. But pea mussel will do for me.
But unlikely to be Pisidium tenuilineatum, the name iSpot has linked to it, as this is one of the rarer species of Pisidium.
Lat/Lng: 51.407136903334, -0.082719326019287
OS grid ref: TQ334693