It is hereby declared that for the purposes of Article 21 in the First Schedule to this Act the M1Law Reform (Contributory Negligence) Act 1945 (including that Act as applied to Scotland), and section two of the M2Law Reform (Miscellaneous Provisions) Act (Northern Ireland) 1948, are provisions of the law of the United Kingdom under which a court may exonerate the carrier wholly or partly from his liability.