Sir Chris Hoy has made history by winning his sixth Olympic title on a day when Britain claimed its best medal haul at a Games for more than a century.
Sir Chris's triumph in the frenzied atmosphere of the velodrome means he now has more golds than any other British Olympian - Sir Steve Redgrave has five.
Team GB's medal tally is now 48 - 22 gold, 13 silver and 13 bronze - making it the most successful Games since the London Olympics of 1908.
After winning the keirin title Sir Chris, 36, rolled around the velodrome draped in the Union flag as the audience, which included Prince Harry, raised the roof. He told the BBC: "It's just unbelievable; it's the most amazing feeling. This is the perfect end to my Olympic career."
Before Sir Chris's record-breaking victory the new star of British women's cycling Laura Trott, 20, won her second gold of the Games. She said: "I can't believe this is happening to me, I really can't. I am so happy."
The outgoing face of British cycling Victoria Pendleton could only manage a silver in her sprint showdown with Australian Anna Meares. The 31-year-old said: "I've been a bit overwhelmed with emotion. I would have loved to have won on my final race but I'm just so glad that's it all done and I can move on."
Earlier the Team GB gold rush continued as the dressage team trotted to a historic victory over Germany. The team of Carl Hester, Laura Bechtolsheimer and Charlotte Dujardin put in an exquisite performance in this most rarefied of equine sports.
The Brownlee brothers raced to Olympic glory in one of the most dramatic races yet at London 2012. Alistair Brownlee took gold and his brother Jonny won bronze despite being given a 15-second penalty.
There was an unexpected bronze in the Olympic Stadium for Londoner Robbie Grabarz in the high jump. Grabarz, one of the most colourful characters in the British team, said: "I'm so happy - I'm over the moon."
And there was further success in Weymouth as Nick Dempsey took silver in the men's windsurfing. He said: "I am just massively relieved, I think, more than anything. I was desperate to finish second here so I am certainly massively happy and glad I could do it for a lot of people that have helped me."