While home installation of CCTV does not fall under the jurisdiction of the Data Protection Act, if the home installation has not been carried out correctly or is being used for a purpose other than for which it was designed, then you may have a case for taking further action under totally different laws.
For example, if you have a camera which is pointed directly at another person’s property or it’s suspected that it can capture part or all of a neighbour’s property, they might have a case to take action against you under legislation covered by the Human Rights Act. They might have sufficient grounds to say that they have had their privacy violated, that your CCTV system is tantamount to harassment and even voyeurism.
In such cases, they can get the police involved if you’re not able to come to some agreement with regards to what the camera(s) can capture and to make modifications to the installation, if necessary.
[Source: problemneighbours.co.uk]