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Possibly a hardy lily?? Or a near relative of lilies.
It's not very like the ones here in my garden..............
Too many leaves in each whorl and the reddish tint of the leaf-bases seems wrong. Martagon flowers are also spread along a length of stem, the mystery plant seems to have a whorl of flower buds.
Lat/Lng: 52.450786660583, 1.5637257097842
OS grid ref: TM422896