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The footage was filmed near the BBC Radio 1 building in Great Portland Street, and shows specks of white light flying at high altitude over the capital.

A larger object then emerges from behind a cloud before vanishing moments later.

The YouTube user who posted the clip online wrote: "Right – took over a week to get it ... but finally managed to get these critters on camera on a clear day, and even get a close-up.

"It seems to be attracting quite a crowd now when they appear. Can anyone explain what on earth these lights are please?"

More on the London UFOs, click here.