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A man has been left with potentially lifelong scars after touching what is described as Britain's most dangerous plant. Daniel Logan stung his ankle on a giant hogweed in Boston Manor Park, west London, while retrieving a football. Toxic sap from the weed, which grows near canals and rivers, can increase the sensitivity of the skin to sunlight, often leading to burns. Â鶹Éç Radio London's Barry Caffrey reports.