Networks of foreign spies are regularly uncovered and Wikileaks continues to release embarrassing documents.
(Listening devices are so small, they are easy to conceal in a room)
Bugging a room is the stuff of legend in old black-and-white movies, although in reality, it is still the most popular way of surreptitiously obtaining information.
There is no law in the UK which says a room cannot be bugged, but there are stringent laws relating to what can and cannot be used. "In the UK, we cannot have CS spray because we cannot harm attackers," she notes, "Whereas in many US states, you can walk in and buy a gun, yet cannot buy a bug or a camera with audio."Anything using a frequency such as UHF or VHF needs a license according to the Wireless and Telegraphy Act.
"Our UHF listening devices are strictly for customers who live outside the EU and they have to sign a declaration," Mrs King explains.
The most common form of listening devices utilises a Sim card and GSM frequencies, as used in ordinary mobile telephones.