Wait. You mean the U.K. isn't governed by the U.S. Constitution? Now I'm all confused
I know your remark is meant as gentle sarcasm but not sure if you would laugh when I tell you I have seen posts on FB where there are people do think we are under the US Constitution, mostly on the Flat Earth Society site though......
Though seriously I have heard people here plead 'the Fifth Amendment'
We have this.......
" The right to silence has been a key part of the English (Anglo-Saxon) legal system for at least a 1000 years, it is possible it was being used as far back as the 7th- 8th centuries, the right to silence remained unchanged for centuries and it is only in recent times (15 years) that a slight amendment has been made to it, this amendment still allows the defendant the right to remain silent, BUT his silence can be presented to a jury as evidence of guilt, but only IF the defendant when questioned by the police refuses to answer BUT later at court presents an alibi, (i.e the prosecution can argue, that the defendant did not have an alibi when questioned, BUT months later suddenly has, which clearly is suspect) there is no law protecting a witness who is called to give evidence at trial, but who when on the stand then refuse's to do so, 'on the grounds that it may expose their own criminal activities', if a witness refuses to testify while on the stand they can be held in contempt of court, and treated accordingly, a defendant can decline to take the stand and speak in his own defence."