Jan 27th, 2011: The growing number of UK tech start-ups in the Old Street area of London has been nicknamed "Silicon Roundabout". The phrase started as a jokey way of comparing London's tech scene with Silicon Valley in California but it has since attracted the attention of the UK government. Tim Bradshaw, digital media correspondent, reports on the companies behind the hype.

For more on Silicon Roundabout and London's emerging technology and startup scene visit the Financial Times at: http://www.ft.com/video