‘If by those words the learned recorder was intending to indicate that his and the justices’ view of the maximum permissible sentence was such that they intended to impose that sentence without any regard either for the circumstances in the case or for any discounts to which the defendant would reasonably be expected to be entitled, then we have to say that such an approach was wrong in principle. Moreover, the maximum sentence for any offence for which such maximum is specified by law should be reserved for the most serious offences of that kind…while any appropriate discount for, for example, a plea of guilty, for the recovery of property through the assistance of a defendant, or for subsequent cooperation with the police, should be made from a level of sentence which is itself commensurate with the seriousness of that offence within the range established by the relevant statute.’