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Are there any Data Protection Act provisions that apply?

Generally if your system looks at public property then you need a good reason, and you need to register as a data controller plus some other stuff. More info here:

http://www.crimereduction.gov.uk/cctvminisite30.htm

However the chances of getting into trouble are practically zero, I don't think anybody has ever been prosecuted.

www.henrys.co.uk is probably the best place I know to buy the equipment.

Gareth