There is more info in the FAQs:
"Our experienced coaches will be looking for all fundamentals needed for an entry level to a competitive swimming. The coaches will not assess the speed but will look for technically competent swimmers who have the ability to swim for 60 minutes n in a Leander training session. Swimmers will need to demonstrate the basics of all 4 strokes for a minimum distance of 25m, competitive starts of the blocks and tumble turns. If you are not sure have a look at our video."
http://www.leanderswimmingclub.org.uk/a ... trial-qas/
"This autumn we’re holding trials for 8-9 year olds to join our competitive squads...Some swimmers who are near the mark may be recommended to the Academy section of the Club. Or it may be a case of developing skills and coming to a future trial."