https://www.techdirt.com/articles/20190516/06282042219/after-five-year-legal-battle-top-judges-rule-that-uks-spying-activities-can-be-challenged-ordinary-courts.shtml

The digital rights group Privacy International has won a major victory against UK government surveillance after a five-year legal battle. One of the many shocking revelations of Edward Snowden was that the UK security and intelligence services break into computers and mobile phones on a massive scale. Privacy International challenged this "bulk" surveillance at the UK's Investigatory Powers Tribunal (IPT), the "judicial body which operates independently of government to provide a right of redress for anyone who believes they have been a victim of unlawful action by a public authority using covert investigative techniques". In February 2016, the IPT dismissed Privacy International's challenge, ruling that:

the UK government may use sweeping 'general warrants' to engage in computer hacking of thousands or even millions of devices, without any approval from by a judge or reasonable grounds for suspicion. The Government argued that it would be lawful in principle to use a single warrant signed off by a Minister (not a judge) to hack every mobile phone in a UK city -- and the IPT agreed with the Government.