In the United Kingdom, upon conviction for murder, the court must sentence the defendant to life imprisonment. The law requires that courts must set a minimum term before they become eligible for parole. For this purpose a number of "starting points" are in place that give guidance to a judge in order to impose a sentence in each different case of murder. There are currently five "starting points" for murder in England and Wales, namely: 12 years' imprisonment for cases of murder committed by a person under 18; 15 years' imprisonment for all "other" cases of murder committed by a person over 18; 25 years' imprisonment for cases of murder where a person over 18 uses a knife or other weapon at the scene; 30 years' imprisonment for cases of murder with "particularly" high aggravating factors, such as those that involve the use of a firearm or explosive, or a murder in the course of committing another offence such as robbery or burglary; and a whole life order, in cases that involve such "exceptionally" high aggravating factors, such as the murder of two or more persons, or the murder of a child following abduction or with sexual/sadistic motivation, meaning the person will never become eligible for parole.