The Act abolishes control orders and replaces them with terrorism prevention and investigation measures (TPIMs). The Home Secretary may serve a TPIM notice where Conditions A–E are met: a reasonable belief of involvement in terrorism‑related activity, that some activity is 'new', and necessity for public protection and to prevent further involvement, together with either prior court permission or urgency. Notices last one year, may be extended once, and may specify measures including residence, travel/exclusion, movement directions, financial and property restrictions, electronic‑device controls, association, work/study limits, reporting, photography and monitoring. Breach is a criminal offence.

Decisions are subject to court scrutiny under judicial review principles (prior permission, urgent reference, directions and review hearings). The Secretary of State must consult police and prosecuting authorities on practicable prosecution, keep necessity under review and publish quarterly reports; an independent reviewer provides annual oversight. Safeguards include disclosure controls, special advocates, limited appeals, powers for entry, search, seizure and retention and for taking fingerprints and samples, and a five‑year sunset with a Parliamentary revival procedure for the TPIM powers.