Britain won a 20th Olympic gold medal on Tuesday to make it the host nation's most successful Games in history.
The gold for the dressage team at Greenwich pushed the gold medal haul for the London Games beyond the 19 that Britain won at the 2008 Beijing Olympics.
Britain is comfortably third in the medals table, behind China and the United States.
The Beijing total had been equalled when Alistair Brownlee won the men's triathlon earlier on Tuesday.
More medals could follow in the track cycling later in the day.
Britain have already won five golds in the Velodrome and Tour de France winner Bradley Wiggins took the cycling time trial title.
Four golds have come from rowing, while a remarkable night in the Olympics Stadium on Saturday produced three golds, for heptathlete Jessica Ennis, Mo Farah in the 10,000m and Greg Rutherford in the long jump.
Sailor Ben Ainslie won the fourth gold of his Olympic career, while Andy Murray beat Roger Federer to take the men's singles title.
Britain's other gold medals came in canoe slalom and shooting and from the team show jumping event.
British competitors have been supported by funding underpinned by the national lottery in preparation for the first Olympics held in London since 1948.