Looks like cow parsley to me. Apart from the spots on hemlock, which I'd describe as red brown blotches along the stem, you could cut the stalk. Cow parsley has a smaller hole in the middle. Hemlock is more or less hollow and also their leaf stalk is oval. Cow parsley leaf stem is round.
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In the sticks near Peterborough
Looks like cow parsley to me. Apart from the spots on hemlock, which I'd describe as red brown blotches along the stem, you could cut the stalk. Cow parsley has a smaller hole in the middle. Hemlock is more or less hollow and also their leaf stalk is oval. Cow parsley leaf stem is round.