FORTUNE -- In the shadow of London's 87-story Shard tower, on the south side of the Thames, a new kind of "brain drain" is underway. The term once referred to talent moving across borders; here, it represents a new phenomenon. Britain's best technical graduates are shunning traditional jobs in banks or large corporations to create their own startups instead.

Image: Entrepreneur First co-founders Alice Bentinck and Matt Clifford want to bring Silicon Valley-style thinking to London. 

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