It is located on a former Docklands site , directly opposite the London Regatta Centre , in the London Borough of Newham in East London , England , and was developed by the engineering company Mowlem in 1986\/87 . It principally serves the financial district of London and is located on a former Docklands site , 6 N east of the City of London , opposite the London Regatta Centre , in the London Borough of Newham in east London . It was developed by the engineering company Mowlem in 1986\/87 .