In simple terms, this is a Court of Appeal decision which considered the use of AFR (Automatic Facial Recognition) by the South Wales police as a means by which they could search against their register of wanted persons. The ICO intervened.
It was held to be unlawful for the Police to use AFR in the detection of crime (where one would have expected public policy to encourage the use of such technology), which raises questions about how the generic and wholesale sale and use of an individual’s car registration index and its whereabouts could also be seen to be lawful.
The full judgement is worth a read. It is available in the Law Library and at the link below. Inter alia, it considers an individual's Article 8 ECHR rights and has some relevance to the collection on personal data by the use of ANPR devices: