BRITISH GAS SCOTTISH SWIMMING CHAMPIONSHIPS Venue: Glasgow Dates: 25 to 28 June
Adlington took 400 gold in Beijing but Jackson beat her in Sheffield
Joanne Jackson aims to take on rival Rebecca Adlington over two distances in August's World Championships in Rome.
Jackson beat Olympic gold medallist Adlington in the 400m freestyle at the British Championships, setting a new world record in the process.
But she will only compete over 800m in the final world trials, the Scottish Championships this week.
"My aim is to qualify for the 800 as well so I can give it a good go in Rome," she told BBC Radio 5 Live.
The two look set to go head-to-head over the longer distance on Friday night in Glasgow, with Jackson admitting the distance is a little long for her.
Adlington has already secured her place in the 800m for the World Championships but - after her defeat by Jackson in Sheffield - must win on Saturday to secure a 400m place.
She also looks likely to race in the 200m on Thursday, seeking to gain a relay place for Rome.
Jackson trains regularly with Adlington and said: "It's great having two people swimming so fast against each other.
"If it wasn't for Becky in Sheffield I don't think I'd have broken the world record."
And Jackson believes someone will have to set a new world record, topping her mark of four minutes 0.66 seconds and breaking the four-minute mark, to win world gold over 400m.
"If you want to win a medal out there you are going to have to break four minutes," she added.
"We don't know how the rest of the world are going to swim but obviously my aim is to break the four-minute mark.
"I was so close to it in Sheffield. Training has been going really well."
Possible highlights:
Heats are during morning and afternoon sessions, finals start at 1745 BST each day.
Thursday:
Women's 100m Butterfly - Ellen Gandy is British record holder but Jemma Lowe will be back from training in the US
Men's 100m Freestyle and Women's 200m Freestyle - world champs relay places are reliant on good performances in these events. Rebecca Adlington will race here.
Men's 1500m Freestyle - David Davies has already qualified but will be looking to get a good time here. Richard Charlesworth and Daniel Fogg will be looking to qualify their places too
Friday:
Men's 400m Freestyle - Davies is the British record- holder but David Carry is also in good form
Women's 800m Freestyle - Eyes will be on Adlington's time but Jo Jackson is also looking to qualify for a worlds spot
Saturday:
Men's 200m Individual Medley - James Goddard qualified in Sheffield and it will be interesting to see who joins him
Women's 400m Freestyle - Adlington needs to win to secure her worlds place in an event where she won Olympic gold. Jackson has withdrawn as she has already qualified
Women's 100m Backstroke - Gemma Spofforth is back from training in America and will be looking to secure her place in her main event
Men's 800m Freestyle - Davies is British record-holder and could potentially lower that further
Women's 200m Butterfly - Gandy is European record holder but Lowe will again be looking to challenge her
Sunday:
Women's 100m Freestyle and Men's 200m Freestyle - Again important for relay qualification
Men's 50m Backstroke - Liam Tancock's main event and the event he broke the world record in last year.
Women's 1500m Freestyle - Will Olympians Cassie Patten or Keri-Anne Payne qualify in this event?
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