# National Heritage Act 1983, Paragraph 10


(1) The fixing of the seal of the Commission shall be authenticated by the signature of the chairman of or some other person authorised either generally or specially by the Commission to act for that purpose.
(2) A document purporting to be duly executed under the seal of the Commission, or to be signed on the Commission’s behalf, shall be received in evidence and, unless the contrary is proved, be deemed to be so executed or signed.

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Source: https://www.legislation.gov.uk/ukpga/1983/47/schedule/3/paragraph/10 (the official version)
Page: https://openlegislation.uk/national-heritage-act-1983/schedule-3/paragraph-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.