In the UK you have the right to remain silent, but "it may harm your defence if you fail to mention, when questioned, something you later come to rely on in cou

In the UK you have the right to remain silent, but "it may harm your defence if you fail to mention, when questioned, something you later come to rely on in court" (or something like that is what the police tell anyone they arrest). So you sorta do sorta don't.