How does British law decide whether a confession can be admitted as evidence?

Under British law, the admissibility of a confession is primarily determined by whether the statement was made voluntarily, rather than by whether specific police procedures were followed.1

A confession may be admitted into evidence provided it was not obtained through:
* Oppression: This includes torture, inhuman or degrading treatment, the use or threat of violence, or excessively prolonged periods of questioning.1
* Unreliability: The confession must not be the result of anything said or done that would be likely to render the statement unreliable.1

Historically, English law prohibited the introduction of any involuntary statement. While this was previously governed by the Judges’ Rules—which required police to caution suspects regarding their right to silence—these were replaced in the mid-1980s by comprehensive provisions and codes of practice. These modern standards focus on ensuring that the integrity of the evidence is not compromised by coercive or unreliable methods.1