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If it is what I think it is - Hemlock water dropwort (Oenanthe crocata) is probably the most poisonous plant in the British Isles. The roots are the most toxic part of the plant and have been eaten in mistake for the roots of several other plant species with often fatal results. So no snacking on this plant!
This is either fine-leaved or hemlock water dropwort- the red stamens such hemlock but need another good photo of fine-leaved to be sure
Lat/Lng: 52.1, -3.4
OS grid ref: SO0451