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What size was it?
Based on the Common Ragwort flower heads, which can be around 25 mm in diameter I would say ≈30 mm. in length.
An iSpot Project- HELP WITH IDS - UK & Ireland Community - PLANTS
Lat/Lng: 53.2053, -0.5667
OS grid ref: SK958685
Backies Wild Flower Meadow, Boultham Moor, Lincoln