Thought it might be Fools parsley but leaves don't look right though it might be before they extend and become thinner?
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... looking at the bracts (at the base of the umbels) and the bracteoles (at the base of the subumbels) is useful. Aethusa cynapium has prominent reflexed bracteoles, which distinguishes it from the other "parsleys". I think that these can be seen in this photograph.
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Lat/Lng: 51.8011, -1.4091
OS grid ref: SP408115