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There's a huge startup community in London. Huge community of VC's, angels, accelerators and startups. The government is aggressively pushing startups through TechCity and is redeveloping apart of the city for startups. http://www.techcityuk.com/#!/home

Most major US startups are basing their international offices in London.

Of course you are right, until a few years ago most development was for the financial industry but it's all changing.