Delays are predicted by the size of the project, with overfunded projects being particularly vulnerable to delay.

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The giant structure, one single piece, had originally been expected to be in place by March, but was delayed because of the size of the project, organisers said.

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The company added the initial size awarded by the Crown Estate was 367 sq miles (950 sq km) and its revised project would be 77 sq miles (200 sq km).

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