By the four chimneys of Battersea power station, between tower cranes and builders’ cabins, is an unobtrusive metal mast. At the top, a watchful figure looks down upon the 3,000 workers bustling around this vast £9bn construction site.

“Female,” says David Morrison, with a deft glance through his binoculars. “She’s protecting her nest site. There was an intruding female about half an hour ago.”

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