This 2011 video from the USA is called Whales in the NY Harbour.
The great white shark in London turned out not to be real.
However, this item is real enough. From ABC in the USA:
Whale Spotted Off Manhattan, NYC – Again!
Aug 12, 2014, 5:12 PM ET
By SARAH FIGALORA
New York City is a classic hot spot for tourists of all shapes, sizes and species — even whales, apparently.
A humpback whale surfaced off the coast of Manhattan, and was just one of many to vacation in the city this summer, an expert said.
“It’s becoming more and more frequent,” Paul Siewada, from the Gotham Whale research division, told ABC News. “What’s caused so much commotion is that people in New York City are just becoming aware that whales are in and around New York.”
There have been 49 whale sightings around Manhattan this year, a number that has been steadily rising for the last three years, Siewada said.
“We know [the whales] go from southern waters down to the coast of the Dominican Republic during the winter and go up to Maine and Massachusetts in the summer to feed,” said Siewada. “We think the whales have found a suitable feeding ground right here in New York.”
This suitable feeding ground, thanks to cleaner water, is what’s keeping some whales hanging around instead of continuing to migrate north.
“My boat captain loves to say the New York City is the new Cape Cod,” said Siewada, so it’s safe to say we can expect more whales in the summers to come.
See also here.
Dear Kitty. Some blog 
New York Harbour? Who knew? But it’s a pretty busy for a whale to explore, you’d think. Lots of ships, large and small, chugging around.
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From Wikipedia:
As of 2011, an expert from Cornell University has recorded the vocalizations of six whale species including the humpback, the fin whale, and the massive blue whale within close proximity of the Verrazzano-Narrows Bridge in the lower portion of New York Harbor and there is at least one company offering marine life tours out of The Rockaway Peninsula in Queens.[15][16] Due to these increasingly frequent visits, new laws address the safety of boaters, commercial fishermen, and the whales themselves: off the coast of Boston, for example, cargo vessels must slow down to protect the much slower North Atlantic Right Whale and there is talk of erecting an apparatus for the much more heavily trafficked waters surrounding New York that can warn boats of a whale’s presence and location so as to avoid accidentally striking the animal.[16]
http://en.wikipedia.org/wiki/Whale_watching#Northeast_Atlantic
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