The initial figure, handed out based on a probability research by David Davis, quoting an overall figure of 4.2 million CCTV cameras in England.
This is based on the premise that there is one CCTV camera for every 14 people. The most recent estimate, cuts this figure down by slightly over half, and puts it at 1.85 million; with 1.75 million privately owned, and the rest spread out across local authorities.