# Uniform Laws on International Sales Act 1967, Paragraph 2


However, a term of the offer stipulating that silence shall amount to acceptance is invalid.
Article 3
An offer or an acceptance need not be evidenced by writing and shall not be subject to any other requirement as to form. In particular, they may be proved by means of witnesses.
Article 4

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Source: https://www.legislation.gov.uk/ukpga/1967/45/schedule/2/paragraph/2n1 (the official version)
Page: https://openlegislation.uk/uniform-laws-on-international-sales-act-1967/schedule-2/paragraph-2n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.