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TechCrunch in London: The battle to be noticed

23 October 2014 Last updated at 13:41 BST

There has been a lot of disruption in London this week - not traffic jams, but technology disruption.

It is an annual event called "TechCrunch Disrupt" and it features ambitious entrepreneurs talking about their start-ups and their plans to conquer all.

Newsnight's David Grossman went down to investigate.