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When 3M's privacy filter first arrived we made many, many jokes about it being designed to stop the colleague on the desk next to you seeing you peruse the less sanitised sections of Torrentspy.

It is an important product for those that deal in sensitive material though, providing you don't stick a piece of paper to the side of your laptop with your password written on it, as a PCW editor once saw on the train.

We had a 15.4in sheet in to test that fitted our 15.4in laptop perfectly. Other sizes are available for bigger or smaller monitors however the price is steep; £30 doesn't seem fair for a piece of plastic.

Horizontal viewing angles were effectively quelled but vertical ones weren't. The whole screen is dimmed and we became so frustrated with it after 15min usage that we didn't want to test it anymore.