Effective duty rate reduction applied to goods cleared from specified North East refineries, limiting excise liability to a reduced proportion. Prescribes an effective duty rate of fifty per cent by exempting, for goods cleared from four named North East refineries, the portion of excise duties in excess of the amount calculated at fifty per cent. The exemption covers duties under the Central Excise Tariff Act schedules, additional duties under the Finance Acts of 1998 and 1999, and the Special Additional Excise Duty provision in the Finance Bill, 2002, and was made under powers conferred by the Central Excise Act and relevant finance enactments.