Ben Ainslie announces Olympic retirement
Great Britain's four times Gold medallist Ben Ainslie has announced his retirement from Olympic sailing.
He said the thrill of winning gold on home waters would be "difficult to top".
Ainslie, 35, became the most decorated Olympic sailor in history with victory in the Finn class at London 2012 to secure his fourth gold.
He is now concentrating on making a challenge in the 35th America's Cup after 2013.
Joe Wilson reports.