“The case concerned the ambit of the Secretary of State’s power under s.5(2) of the Intelligence Services Act 1994 to issue warrants to the Government Communication Headquarters, authorising intelligence activities such as computer hacking. It prompted the court to review both the aversion of the common law to general warrants and the canon of statutory interpretation known as ‘the principle of legality’ and then to consider the lawfulness of so-called ‘thematic’ warrants aimed at an entire class of persons or category of equipment ...”
ADDED Tuesday 27th April 2021