Youngsters have until Saturday to apply for an Oyster photocard to travel on London's buses.
Under-14s do not currently need to have a photocard to benefit from free travel in the capital.
But from June 1 all 11 to 15-year-olds will need a valid Oyster photocard to travel free on buses and trams.
Any child who does not have a card must apply by May 10 to make sure they receive it in time.
They can be withdrawn if the cardholder misbehaves on a bus, as they already can be for teenagers aged over 14.
The card, which has been named the Zip card, can be applied for at post offices.
To find out more information, visit the Transport for London website.
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