Investigatory Powers Commissioner’s Office to ensure intelligence and government services act within new law
Among organisations overseen by the IPCO are the government’s monitoring agency GCHQ, MI5, MI6, the National Crime Agency, all police forces, the Serious Fraud Office, HM Revenue and Customs, local authorities, prisons and government departments.
The body replaces the work of the previously separate surveillance commissioner, interception of communications commissioner and intelligence services commissioner.
https://www.theguardian.com/world/2017/sep/01/uk-surveillance-and-spying-watchdog-begins-work