Stunned bystanders, including a family with a pram, watch in awe as he pushes himself off one wall, somersaults over the drop and clears the other side.

Drone footage captured the incredible feat from above by vlogger and “urban explorer” Harry Gallagher, who goes by Night Scape on YouTube.

Security at the iconic arts building on the Strand in central London, which attracts millions of visitors, could be seen anticipating the epic jump – known as a “Kong front flip”.

Footage shows one of the guards telling Harry to get down from the wall where he was operating the drone, adding: “You can’t be there”.

Harry replies: “I’m just filming mate”, before he appears to be yanked from his perch and shouts: “What are you doing? I could’ve fallen off that f***ing wall.”

But undeterred by staff and pumped with adrenaline, Greg decided to give the jump another shot – this time getting a round of applause by a gathered crowd.

Security staff appeared to get more annoyed by the antics and tried to block the space off with metal chairs.

Greg crosses the traffic to other side of the road before sprinting back and clearing the jump – and the seats – for a third time.

An even bigger crowd has been drawn by this stage and the victorious parkour fan is met by cheers and a round of high-fives.

Harry has previously collaborated with controversial YouTube star Louis Cole as they climbed a skyscraper in the City of London.

His big break online came after he and two friends sneaked into West Ham’s stadium at the Olympic Park in East London.

They roamed on the pitch and in the terraces, and Harry posed with his feet dangling from the roof.

The video – viewed more than four million times on YouTube – sparked 13 copycat attempts in the following weeks but police said they would not prosecute him.