On the whole, British police officers tend to be professional and polite, and are generally less aggressive than law enforcement agencies in other developed nations (however, this does not mean they are lenient). The vast majority of British police officers do not carry firearms on standard patrol, and the only time one would usually see a "Bobby" with a weapon is at ports or when there is a suspicion they will meet armed offenders. The exception to this is Northern Ireland, where all Police are armed. Most officers will only speak English and you will be made to speak to an interpreter over police radio or will do so at a police station if you cannot communicate in English. You have the legal right to remain silent during and after arrest - but police in England and Wales will warn you that "You do not have to say anything, but it may harm your defence if you do not mention when questioned something which you later rely on in court. Anything you do say may be given in evidence".