Christine Ohuruogu has won Britain's 16th Olympic gold medal by becoming the first British woman to win the Olympic 400 metres race.
Earlier, Scottish cyclist Chris Hoy became the first Briton to win three golds in a Games for 100 years, beating team-mate Jason Kenny in the sprint.
Victoria Pendleton also won gold in the women's sprint, while Paul Goodison took gold in sailing's laser class.
And high jumper Germaine Mason joined Jason Kenny in winning a silver medal.
Ohuruogu's victory comes a year after she completed a 12-month ban for missing three drugs tests.
After her win she said: "You never think it's a reality, it's something you dream about. As I came across the line I thought 'oh my gosh' - I don't know what to say."
With five days of the Games left, British athletes have already achieved one of the nation's greatest medal hauls at an Olympic Games.
And they've climbed back up to third place in the medals table, behind China and America.
To mark their success, it's been announced that medallists returning from the 2008 Beijing Olympic Games will get a victory parade through the streets of London.
The parade will also celebrate the achievements of competitors taking part in the Paralympic Games next month.