Big interview: A vision for young London - Caroline Boswell, head of children and young people's unit, Greater London Authority

Since the publication of that weighty 139-page tome, City Hall has been quietly doing much of the work to turn the strategy's vision into a reality.

And the announcement this week that under-16s will travel for free on London's buses and trams will make the strategy a lot more real for the capital's teenagers.

The demand for free travel was something that came directly from the city's young people, says Caroline Boswell, head of the Greater London Authority's children and young people's unit.

"Since the unit was formed in April 2004, we've been pushing ahead with the strategy," says Boswell. "The unit's primary focus is to lead on the implementation of that strategy and a particular focus within that is ensuring young Londoners have a voice. So we went to find out what young people's priorities for change were and one of the main ideas was making London more affordable and accessible."