THE number of surveillance cameras in Britain is set to double over the next three years to 2m following Home Office approval of a new system that can be run at a fraction of the cost of existing networks. The new system is a wireless application which employs mobile phone technology to beam pictures from cameras to portable monitoring devices such as laptops and hand-held PCs. It will cost up to 80% less than conventional closed-circuit television (CCTV) packages because it eliminates the need for expensive cabling.