TPims

They are Terrorism Prevention and Investigation Measures, to give them their proper name. They are placed on terror suspects - who officials decide can neither be charged nor deported - by the home secretary.

The home secretary can consider putting a TPim in place after an MI5 assessment of the suspect and must "reasonably believe" he or she is involved in terrorist-related activities.

The measures include electronic tagging, reporting regularly to the police and facing "tightly defined exclusion from particular places and the prevention of travel overseas". A suspect must live at home and stay there overnight - possibly for up to 10 hours. However, they can apply to the courts to stay elsewhere. The suspect is allowed to use a mobile phone and the internet, to work and study, subject to conditions.

,Between 2011 and December 2020, there have been 24 individuals served with a TPIM notice.

• As of 30 November 2021, there were 4 individuals on a TPIM.

2025 The government proposed introducing State Threats Prevention and Investigation Measures (STPIMs), which will provide a suite of restrictive measures that can be used, where the government deem it necessary, to prevent an individual’s further involvement in state threats activity where prosecution and other disruptive actions are not possible. This is in response to perceived threats from individuals working for  Russia and or China.