大象传媒

Usain Bolt's gold at the 100 metres in Rio makes him the first person in history to win the medal three times and cements his position as a sporting superstar. It also makes him even more lucrative for sponsors but his main backer Puma, which has been with him for most of his career, has been accused of being too slow to make the most of his success.

Accounting giant PwC faces a $5.5bn damages claim from the victims of a US banking collapse - it poses a real threat to the firm's finances and has raised questions over whether audit firms are responsible for detecting fraud.

Plus, Zambia's president narrowly wins re-election despite the country's mounting economic problems, and we hear how cotton mills are returning to the UK after a 30-year absence.