The UK Anti-Doping watchdog is to launch an independent investigation into its handling of allegations that a private doctor supplied performance-enhancing drugs to top footballers and other sports stars, as leading Premier League football clubs denied having anything to do with him. Dr Mark Bonar was secretly filmed by The Sunday Times claiming he had treated 150 British and foreign sportspeople, including Premier League footballers from clubs such as Arsenal, Chelsea, Leicester City and Birmingham City, an England international cricketer, British cyclists, a British boxer, tennis players and martial arts fighters. He was recorded as he prescribed the banned substance erythropoietin (EPO), which increases the production of red blood cells, to an aspiring athlete and he also alleged he had prescribed drugs including steroids and human growth hormone. Dr Bonar even claimed to have treated two professional dancers who ha...