In practice, the privilege against self-incrimination allows a person to refuse to answer questions or provide information in proceedings or investigations where doing so would create a real and appreciable risk of criminal prosecution or a criminal penalty. It is a common law principle recognised through case law and Article 6 ECHR across England & Wales, Scotland, Northern Ireland and Ireland, and is modified in places by statute.Key features:- Applies in criminal, civil, regulatory and disciplinary contexts (including disclosure, interrogatories and compelled interviews).- Must be claimed by the individual when the risk arises; courts may require the claimant to show a proper basis. It cannot be used to resist non-incriminating questions.- Belongs to natural persons, not corporations (though company officers may claim personally).- Protects compelled testimonial communications; it generally does not extend to real/physical evidence (e.g. fingerprints, breath tests).In criminal cases, the right to silence and the ban on using compelled statements at trial are core (ECHR). England & Wales and Northern Ireland permit limited adverse inferences from silence by statute; Scotland does not adopt that regime; Ireland permits specified statutory inferences.Statutes may curtail the privilege (e.g. certain intellectual property disclosure orders and regulatory powers), typically coupled with restrictions on use of compelled answers in later criminal proceedings.