Black Hornet spycam is a 'lifesaver' for British troops.

Sergeant Carl James Boyd demonstrates how the Norwegian-designed Black Hornet Nano will be used for surveillance operations in Afghanistan.

The drones can fly around corners and obstacles to identify potential hidden dangers, the Ministry of Defence has said. It features a tiny camera and relays video and still images to a handheld control terminal.

It measures about 10cm by 2.5cm (4in by 1in) and weighs 16g (0.6oz).

Sergeant Boyd described the piece of kit as a "lifesaver".