Laura Trott won her second gold medal of the Track Cycling World Championships in London with victory in the women's omnium on Sunday's final day, but Jason Kenny's Keirin bid ended in disappointment.
Trott, who won the non-Olympic scratch race on Thursday, enhanced her advantage with a mature display in the concluding points race to claim Britain's fourth gold of the five-day competition at the Lee Valley VeloPark where she won two Olympic gold medals in 2012.
The 23-year-old from Cheshunt now has seven world titles, three individual crowns and a first omnium world title since 2012, when she went on to win Olympic gold. She will hope for a repeat in Rio in August.
Trott finished with 201 points and France's Laurie Berthon claimed silver on the last of 10 sprints in the points race to beat Sarah Hammer of the United States by one point. Berthon finished with 183 points to Hammer's 182.
Kenny, the sprint champion on Saturday and Trott's fiance, sat up on the final lap of the men's Keirin, won by Germany's Joachim Eilers, with an apparent mechanical problem.
He completed the race, finishing sixth as Ed Dawkins of New Zealand took silver and Awang Azizulhasni of Malaysia bronze.
Kenny had won the Keirin title in 2013, but was unable to reclaim the rainbow jersey as Trott pulled on the one for omnium champion for the first time in four years.
She has long targeted Sir Chris Hoy's British record haul of six Olympic gold medals and moved within four of his World Championship tally of 11 with the victory.
"I love the number seven - I can retire happy now," said Trott, who has four team pursuit world titles to her name and won bronze in the event on Friday.
"I might be able to do four in one go, because I could do the omnium, the team pursuit, the points race and the scratch."
Trott had 184 points entering the concluding points race after consolidating her advantage in the fourth and fifth disciplines.
Trott was third in the 500metres time-trial and Hammer, the joint overnight leader, 10th. It meant Trott opened up a 14-point lead ahead of the flying lap, the penultimate discipline.
Trott was third and Hammer fifth, but Berthon's second second place of the morning bumped her up to second overall.
The Briton won the first and fifth sprints to take a near unassailable lead which she protected to the finish.
Trott said: "I'm just so happy. It's taken me four years to get a gold medal back in the omnium. It was just incredible.
"Last night I went to bed and I didn't really know what was going to happen. I was a little disappointed that I didn't win the elimination race.
"I rode stupidly. I should've taken Sarah down to the black line and I didn't. I took her up and I kept it fast. That is something that she's good at. I couldn't match her.
"(I was) not angry, just disappointed. Elimination race is my thing. I really enjoy that event. I felt like the wind had been blown out of my sails a little bit.
"I had such a high after Jason won the sprint that I was buzzing and after that, I was 'oh, okay'.
"Today it was a new day, I woke up feeling really positive."
Trott was pleased with her points race performance.
She added: "I felt so good in that. Paul (Manning, her coach) had said to me before the start 'take out the first points and you'll feel confident, you'll feel comfortable'.
"That's exactly what I did. After that I could ride my own race. I wasn't really bothered about what was going on with Sarah and Laurie because they were having their own battle."