The Prime Minister, Gordon Brown, has told officers that offenders of any age should be charged if found in possession of a knife, instead of cautioned. Brown unveiled the plan in an interview with The Sun newspaper. He said: "It is completely unacceptable to carry a knife or a gun. Where police have previously been cautioning people, there now has to be a presumption of prosecution." The 12 areas are mainly in London, Liverpool, Manchester and Nottingham. The government is expected...