from the ico site
http://ico.org.uk/Global/faqs/cctv#f1D16765F-E3A6-4397-8D70-99EE6D7516AA
and it says this ( about CCTV )
Can I, or my neighbour, use CCTV?
If the cameras are installed on residential property and are for personal domestic use, they are unlikely to breach the Data Protection Act. This is because the use of CCTV cameras for domestic purposes, for example, protecting a home from burglary, is exempt from the data protection principles, even if the camera overlooks the street or other areas near the house. If you are concerned about the use of domestic CCTV, it may be worth contacting your local police. However, if you or your neighbour are using CCTV for business purposes, you'll need to comply with the Act
( oh and if you do contact the police they say they arent interested )
Honestly we are making a bit of a meal about this
Shoota - really good site - which basically says the same