London's party scene is facing 'annihilation' with more than 1,100 bars and clubs shutting in just three years and countless others hampered by curtailed drinking hours, threats from housing developers and rising costs. London's 'night czar' Amy Lamé, pictured here with the capital's mayor Sadiq Khan, has been criticised for her 'globe-trotting' while many of the city's pubs and clubs …