Unmanned aerial vehicle
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How tiny drones offer a unique view

29 June 2012 Last updated at 08:19 BST

Unmanned Aerial Vehicles (UAVs) or drones are usually associated with the military or the intelligence services.

But now commercial companies and civil government bodies are taking an increasing interest in the smaller versions, known as nano-UAVs, because of their unique surveillance capabilities.

The BBC's Frank Gardner went to Cotswold Airfield to watch a demonstration.