Adlington now holds the Commonwealth 400m and 800m freestyle records

Rebecca Adlington claimed her second Commonwealth record of the week when she broke the longest-standing British women's record in the 800m freestyle.

Sarah Hardcastle had held the record since 1986, but 19-year-old Adlington destroyed it by more than five seconds at the Olympic trials in Sheffield.

Her 8:19.22 time was less than 0.5secs outside the European record of Olympic silver medallist Laure Manaudou.

Rebecca Cooke, Jo Jackson and Cassie Patten also qualified for the final.

Swimmers have to achieve the Olympic qualifying time in the heats and then need to finish in the top two in the final to earn selection.

"My coach and I discussed breaking the British record earlier this week and he was going to signal me if I slipped off the pace," said Adlington.

"I didn't see any signs but I didn't think I would go sub 8:30. To beat a 19-year-old record is amazing and to get so close to the best in the world is frightening.

"I still have it all to do on Saturday. It will be a tight final and I know nothing is guaranteed."

Thomas Haffield took more than six seconds off his personal best to set a new Commonwealth record of 4:12.59 in the 400m individual medley.

Euan Dale and Joe Roebuck also qualified for Friday's final.

Jemma Lowe reclaimed her British 100m butterfly record just minutes after Fran Halsall broke her original record.

Halsall set a then record of 58.44 seconds before Lowe responded in the next heat with a time of 57.78s to wipe out the Liverpool swimmer's mark.

"I was confident because of the split I did at the Europeans," said Lowe.

"Seeing someone had stolen my record in the heat before made me a bit angry, but it also made me a bit more scared."

Ellen Gandy and Terri Dunning also achieved the necessary time so the quartet will fight for two places on Friday.

Kris Gilchrist was only half a second outside his British record as he comfortably qualified in the heats of the 200m breaststroke.

The City of Edinburgh swimmer, who has already made it on to the team in the 100m version, led from start to finish and touched in two minutes 2:10.82.

Only he and James Kirton, who produced a perfectly controlled swim and led from the start to set a new personal best of 2:12.93 in his hometown pool, achieved the required time.

In order to replicate the programme in Beijing, heats are swum in the evening with the finals the following morning.