Britain's sailors and rowers won three more gold medals on a day which could yet eclipse the team's phenomenal "Super Saturday" performance.
The Yngling trio of Sarah Ayton, Sarah Webb and Pippa Wilson clinched the first gold of the day, with Ben Ainslie following suit in the Finn class.
The men's rowing lightweight double sculls triumphed, but the women's quadruple sculls were edged for gold.
Another gold is guaranteed in the all-British women's cycling pursuit final.
Rebecca Romero will face GB team-mate Wendy Houvenaghel at the Laoshan Velodrome to earn Britain both gold and silver.
Britain have already won eight cycling medals, two on the road and six on the track, with Bradley Wiggins and Chris Hoy both striking gold on Saturday.
After four golds on Saturday, Team GB's total of 10 golds for the Games moved them up to third place in the medal table.
At the Shunyi rowing lake, British rowers added to Saturday's gold for the men's coxless four.
Zac Purchase and Mark Hunter, in the men's lightweight double sculls, put in a superbly controlled performance to outwit the Greek boat and take gold, as had been widely predicted.
The men's eight are also in with a strong medal chance, but the women's quadruple sculls were hugely disappointed to finish behind China with silver.
Ayton, Webb and Wilson, in sailing's Yngling class, earned Britain's first gold medal on Sunday.
The crew battled home in first place in their medal race, well ahead of their Dutch rivals, to seal gold.
"Winning an Olympic gold medal, you're the best at what you do in the world," said skipper Ayton.
"You just can't describe what Sarah and I have been through for the last four years and with us and Pippa for the last two."
Purchase and Hunter added gold number two, earning Britain's first ever lightweight rowing gold medal by a comfortable distance over Greece.
"It's unbelievable," a breathless Purchase told BBC Sport. "We sat down back in October and said we wanted to come here and win this.
"We knew Greece would come back, we had to have a solid middle 1000m to make sure we crossed the line first, and then it was a case of holding on and keeping going."
Ainslie claimed Britain's third gold of the day back in Qingdao, keeping US rival Zach Railey at bay to claim the third Olympic gold of his sailing career.
"Yesterday the breeze was very light and I couldn't give the American guy any chance to get away from me," said Ainslie afterwards.
"Today I was more confident with my speed against his, and my fitness," he added, having crossed the line first in his medal race.
Britons missed several outside chances for medals during Sunday's action in Beijing.
Paula Radcliffe finished 23rd in the women's marathon and David Davies could only place sixth in the men's 1500m freestyle swimming.
(BBC)
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