Aspiring spies will be interested to note a new product from that offers a modern twist on the spy-cam.

An innocuous-looking, standard-sized Coca Cola "Zero" can will record digital video and audio with its built-in camera.

It's said to be so realistic even the bottom of the can looks completely normal, but you can pull out the camera innards to reveal the controls.  

Just switch it on and leave in situ to record colour video (that's time and date stamped) with sound, says the retailer.

The Coca Cola Zero can camera is available now for £115.