Double Olympic champion Rebecca Adlington made a statement of intent as she booked a spot on the Great Britain team with a dominant 400 metres freestyle victory in the Olympic trials at the Aquatics Centre.
The 23-year-old led from start to finish to touch in four minutes 02.35 seconds, faster than the time that saw her claim the Olympic title as well as silver at last year's World Championships.
Olympic bronze medallist Jo Jackson held off fast-finishing Eleanor Faulkner as she left behind the illness and asthma that had so affected her since autumn 2009. Former relay world medallist Jaz Carlin was fourth.
As well as Adlington and Jackson, Ellen Gandy set a British record as she and Fran Halsall made the team in the 100m butterfly.
The men were not to be outdone with Daniel Sliwinski and 17-year-old world junior champion Craig Benson qualifying in the 100m breaststroke to bring to 11 the swimmers who have so far booked a London berth.
Adlington was clearly emotional after a race where, although admittedly nervous, she was determined to attack.
She said: "There is so much relief, happiness, excitement. It's an amazing feeling. I just started crying because it is four years of training, it's not just since Shanghai (2011 World Championships).
"I know the younger guys have got the next Olympics but London has always been my target and to know I am now going is the best thing in the world."
Of swimming alongside friend Jackson, Adlington said: "Me and Jo have so much experience together - I missed her last year when she wasn't there. We are so used to each other and we are such close friends."
In the multi-disability events, Jonathan Fox won the 100m backstroke with James Anderson taking the 50m event. Hannah Russell won the women's 100m backstroke.
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