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Beth Tweddle wins the uneven bars world title in 2010 (UK only)

"We are very clear that our priority is to qualify both of our teams for London at this first opportunity," said performance director Tim Jones.

"From the way our preparations in recent weeks have gone and the quality of the gymnasts, we believe we have every chance of achieving this goal."

At a major gymnastics event, qualifying works by sending your team of six gymnasts in to perform on every piece of apparatus - the British women go on Saturday evening Japanese time (1200 BST), and the men on Monday morning (0315 BST).

Add up the four best scores your gymnasts produce on each piece, and that gives you the team's overall total. The top eight nations' teams go through to the team final - which will be Tuesday for women, Wednesday for men. The scores from qualifying are also used to determine who goes into the individual finals, which run from Thursday to Sunday.

So one qualifying session goes a long way. Places in this year's finals and next year's Olympics rest on those British performances on Saturday and Monday.

If it doesn't happen, all is not lost. Teams who come through qualification in ninth to 16th place must instead go to the , at London's O2 Arena in January next year, and the top four teams there will still make it to the Games.

But that would be far from ideal for the British team. They want to make sure of qualification for the Games now, leaving them the whole winter for gymnasts to recover from Worlds, plan their 2012 campaign and have the maximum time to prepare the very best routines. As outspoken pommel horse star Louis Smith constantly reminds people, you need to have something up your sleeve for the Olympic event to surprise your rivals and the judges.

If you have to haul yourselves to the Olympic test event and qualify via that route, it means an extra "peak" after the months-long process of building up your athlete for a major event, which takes up their time and energy, and that of their coaches.

Far easier to get the job done now and use those months planning for 2012 rather than biting your nails off in worry about just getting there. Unthinkably, if Britain's teams failed to make the top four there, as few as two Brits (a man and a woman) could end up competing at the Games. That scenario is possible, but very unlikely.

You can understand the urgency all this lends to qualifying. However, if Britain come through that successfully, then finals will start to matter again.

Dan Keatings - praying for injury-free return to action (Photo: PA)

Beth Tweddle is the current , having nailed her routine - one of the most complex in the world - in Rotterdam last year as Chinese duo He Kexin and Huang Qiushuang both fell.

Those two are both back this year and will be determined to lift a title which, had they stayed on the bars, they had every chance of winning last time. That's what the sport is about, balancing the higher score you get for trickier moves against the risk of messing it up.

One of Tweddle's assets lies in usually striking that balance. As she said after winning the title: "It was theirs to lose and mine to gain. That's what happened."

Tweddle may also be a threat on the floor, a title she won in 2009 before failing to reach the 2010 final (won by Australia's Lauren Mitchell, an overdue world gold for her).

Watch out for GB's Hannah Whelan in the all-around event (all four pieces of apparatus), a final which has been blown wide open by the absence of , who suffered ligament damage at the European Championships earlier this year.

Mustafina reached every final last year and won all-around gold. Russia's leading lights are Youth Olympic champion Viktoria Komova and European champion Anna Dementyeva in her place.

Injury has also hampered the American team. Only two of the US women's squad who travelled here have previous Worlds experience, and both of those - Alicia Sacramone and Aly Raisman - have picked up knocks since arriving, in Sacramone's case to the extent that . How copes, particularly 16-year-old newcomer Jordyn Wieber, will be interesting.

In the men's events, Smith's personality has earned him the poster-boy tag ahead of 2012 but he needs a strong performance here in Tokyo. At the very least, he needs to stay on the horse.

Smith fell from the apparatus at this year's European Championships, as he did at the World Championships in London two years ago. Again, he's trying to balance an incredibly difficult routine against the risk of falling.

Louis Smith falls from the pommel horse at the 2011 Euros (UK only)

"It's the hardest routine in the world and it's what hopefully will set me apart and help me stand out," .

If executed perfectly, that routine will win Smith an Olympic gold medal. However, if it only has (say) a 50% success rate, at what point does that become too much of a liability to take to the Games?

Daniel Keatings for the first time since winning all-around silver in 2009, following sustained just after becoming the European champion in 2010.

Hearteningly for the British team, Keatings reckons . If that proves the case, he and Dan Purvis, a world bronze medallist on the floor from last year, will lend GB an exceptionally strong core.

China, as ever, are the major medal threat across the men's events. Only one of the seven men named in their squad has not previously won at least one world title and he, Guo Weiyang, is the current .

But keep an eye on hosts Japan, too. We're inside the venue where Japanese men won five of the eight Olympic titles available on home turf at the 1964 Games, and the team this year looks as strong.

Star name is looking to make history as the first man to win the all-around title three times in a row. And the Tanaka family should be out in force to see not one but three of their children in action: Kazuhito and Yusuke Tanaka in the men's events, and sister Rie in the women's. Mum and dad , too.

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