Where the proper law of a hire purchase agreement would, apart from a term that it should be the law of some other country or a term to the like effect, be the law of any part of the United Kingdom, or where any such agreement contains a term which purports to substitute, or has the effect of substituting, provisions of the law of some other country for all or any of the provisions of sections 8 to 12 above, those sections shall, notwithstanding that term, apply to the agreement.