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Presence of bracts, along with the grooved stems, would indicate Oenanthe crocata. I would have expected to see bracteoles as well, but can't spot any in the photos.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 51.5695, -3.6032
OS grid ref: SS889868
on rural roadside