It appears that this was part of a Top Gear stunt being filmed at Canary Wharf (hence the camera ship) - late afternoon on a misty day lowered the quality of the shots unfortunately!
Chinook HC4 ZD980 (2) @ Gallions Reach 12-03-16 by
A Christy, on Flickr
Chinook HC4 ZD980 (10) @ Gallions Reach 12-03-16 by
A Christy, on Flickr
Chinook HC4 ZD980 (13) @ Gallions Reach 12-03-16 by
A Christy, on Flickr