You can use CCTV to protect your property but you must follow the legislation under the Data Protection Act.
-put up a sign to let people know CCTV is being used and why
-be able to provide images within 40 days to anyone you’ve recorded (you can charge up to £10 for this)
-share images with the authorities, eg the police, if they ask for them
-keep images only as long as your business needs them
For more Information Commissioner’s Office (ICO) has guidance on how to use CCTV cameras and storing images.