A vigorous hairless perennial that twines round other plants to assist its progress in the hedgerow.
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You need to see the bracts at the base of the flower to be sure this is not Calystegia silvatica.
Lat/Lng: 50.25613, -4.88269
OS grid ref: SW946435
Historic village in dairy farmland with some arable fields. Cornish field-patterns and lanes with well-established hedgerows.