Name the structure?

Yep I'm ripping off Tom's question, but just this once. Can you guess what this structure in Chichester, England is supposed to be.
Name the structure?
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1 y
Little clue. They scream when you boil them then you poke them in the head with a pin and pick their hat off.
Updates
1 y
The correct answer is a winkle (periwinkle,)
Name the structure?
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