Only 3% of children in London aged between seven and 11 can swim competently, Swim England figures show.
Competency measures judged by the governing body included being able to swim 100m without stopping and treading water for at least 30 seconds.
Researchers found that most parents wanted their children to learn but few had recently taken them swimming.
Swim England said they were worried about how few had reached the minimum standard of the “vital life skill”.
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