It's the seed heads of something umbelliferous. Colour-wise it looks just like my Anthriscus "Ravenswing" (purple cow parsley) and is at about the same stage of seed pod development, but we don't have enough information for a good ID.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Interesting.
Where was this found?
What do the leaves look like?