The UK authorities have purchased IMSI-catcher technology that could be used for dragnet surveillance. Rights groups are demanding for transparency from the police about the use of surveillance technology. The law enforcement has reportedly purchased covert communications data capture equipment (CCDC) from a UK firm, the Cellxion. It is still unclear whether the UK police and intelligence agencies have used IMSi-catchers and in which kind of operations are being used in the UK.”]
Source: https://securityaffairs.co/wordpress/52365/laws-and-regulations/imsi-catcher-uk.html