The 19-year-old, already a gold medallist after Britain's superb team pursuit display on Thursday, claimed another success as she topped the overall table in the six-event discipline by three points.

She finished second in the flying lap, eighth in the points race and won the elimination race on Friday before placing third in the individual pursuit, 13th in the scratch race and winning the 500m time trial on Saturday.

And Trott, who beat Australia's Annette Edmondson into second place, admitted that the victory came as a surprise.

"I think I'm setting myself up well for London. I'm pretty shocked," Trott said.

"The world record and World Championship in the team pursuit would've been enough for me. To come here and win the omnium I'm just over the moon.

"I didn't expect to win. I thought maybe I would pick up a medal, because I had been in the World Cups, but to win - what more can I ask for?"

Unbeaten

Trott's unbeaten run in the omnium's final event dates back to December 2010, but she believes her performance in the penultimate discipline was the key to her success.

"It's such a hit-or-miss race, you never know what's going to happen," said Trott, who finished one place ahead of Edmondson in the scratch race.

"My tactic was just to follow the Australian around all day long and when she started to move just make sure that I nipped her on the line. It was a closer race than I wanted it to be.

"In the 500 I just did what I always do. I nailed it."

Trott was tied for first overnight with Edmondson and had revealed that she did not have the best night's sleep before the all-important final day.

She added: "My head was going round, what if this happens? What if that happens? What if I crash in the scratch race? It will be all over. This morning I felt like I had a hangover.

"The dope control came round at 8.30am. I was already up because I couldn't sleep."