How would you solve London's housing crisis? 

Architects have come up with some radical solutions to solve the housing crisis. Several suggested floating homes on the city’s canals and rivers, a mega-city built on the M25, or building over roads and railway lines.

These are just some of the 100 ideas that were as part of a competition.  

Ten of the plans will be presented to Boris Johnson, and considered by officials working on building the city of the future.

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