Terrorism offences are governed by the Terrorism Acts 2000 and 2006, covering activities such as the 'encouragement of terrorism' and 'preparation of terrorist acts'. The Crime and Policing Bill 2025 introduces 'youth diversion orders', a counter-terrorism risk management tool for individuals under 21 aimed at mitigating radicalisation risks. These investigations are highly sensitive and often involve the intelligence services, requiring a technical defence to manage the disclosure of 'closed material' and digital communications data.

Defending terrorism charges requires specialised expertise in digital forensics and international law, particularly regarding the interpretation of ideological material. The Economic Crime and Corporate Transparency Act 2023 has introduced new powers to seize suspected criminal cryptoassets intended for terrorist purposes. Strategic representation is critical during port stops and the management of Terrorism Prevention and Investigation Measures (TPIMs), which can impose severe restrictions on movements. The defence role also involves challenging the legality of surveillance warrants and ensuring that the public interest in the confidentiality of journalistic sources is protected under the latest codes of practice.