By Ali Lyon The American businessman behind Manchester’s new £365m Co-op Live arena is considering building a second glitzy venue in the UK, this time in Hammersmith, arguing the capital is underserved by its current entertainment options. The move from Tim Leiweke, who set up the sports and entertainment investment outfit Oak View Group, would put him in direct competition with the O2 Arena, much of the success of which is attributed to Mr Leiweke. The entertainment mogul spent nearly two decades at Anschutz Entertainment Group (AEG), and was responsible for the O2’s transition from the ailin…