The Parish Council’s power to buy Smart Water, support the Neighbourhood Watch and consider the installation of village CCTV comes from:
Local Government and Rating Act 1997
Section 31: Crime prevention.
(1) A parish council or community council may, for the detection or prevention of crime in their area—
(a) install and maintain any equipment,
(b) establish and maintain any scheme, or
(c) assist others to install and maintain any equipment or to establish and maintain any scheme.