World Championship silver medallist Hannah Miley booked her place on the Great Britain Olympic team as she swam her fastest ever 400 metres individual medley in textiles at the Aquatics Centre.
The Garioch swimmer led from start to finish to touch in four minutes 32.67 seconds, a time only she has bettered domestically.
Aimee Willmott lowered her personal best by more than a second to 4mins 37.48 to also see herself on to the squad after enduring a disappointing 2011 where she failed to make the World Championships.
The event had started with local boy Roberto Pavoni and Joe Roebuck also securing their places in the men's equivalent.
Willmott failed to make the team for Shanghai last year after being disqualified in the first trials in Manchester before her Psychology A Level clashed with the second stage in Sheffield.
Steph Proud was third with Keri-Anne Payne fifth, the world open water champion will now look to qualify in the 800m freestyle.
The men's equivalent had opened proceedings in Stratford.
Pavoni drew away on the breaststroke and although Roebuck made some inroads on the final 50m, the World Championship finalist touched in a personal best of 4:12.43, 2.05s ahead with both swimmers well within the qualifying time.
Pavoni's success meant the first victory ever at the venue was by a local swimmer, the former European junior champion living 20 minutes away from the Aquatics Centre in Brentwood, Essex. Matthew Johnson's time of 4:16.53 was especially impressive for a 16-year-old.
Robbie Renwick also booked his spot on the team in the 400m freestyle with 3:46.73 but David Carry's 3:48.36 was 0.23 outside the time required and he will have to try again in Sheffield in June.
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