A “rooftopping” video has appeared online showing a daredevil gaining access to the iconic One Canada Square office building in Canary Wharf.

The YouTube video appears to show Harry Gallagher, also known as Night Scape, get past security gates in the skyscraper before taking a lift to an upper floor and then using the stairwell to get on to the roof.

Supporting himself one just hand, Gallagher appears in the vertigo-inducing video on the famous pyramid atop the 230 metre tall building.

The act of “hacking” a building to gain access to its roof space has become known as rooftopping.

A Canary Wharf Group spokesperson is reported to have commented: “We are actively investigating unauthorised entry into One Canada Square, on the Canary Wharf Estate.

“Current arrangements have been tightened, while our security procedures are being reviewed and an internal investigation conducted.

“We are working closely with the Metropolitan Police on this matter. Our priority is to ensure the safety of our tenants, employees and those visiting the Estate.”

One Canada Square at Canary Wharf is the second highest tallest building the country.

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