# The London Government Reorganisation (Pensions etc.) Order 1989, Paragraph 3


(1) The application of the Authority’s seal shall be authenticated by the signature of the Chairman or of a member or officer of the Authority authorised either generally or specially by the Authority for that purpose.
(2) Any document purporting to be a document duly executed under the seal of the Authority shall be received in evidence and shall, unless the contrary is proved, be deemed to be so executed.

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Source: https://www.legislation.gov.uk/uksi/1989/1815/schedule/1/paragraph/3 (the official version)
Page: https://openlegislation.uk/london-government-reorganisation-pensions-etc-order-1989/schedule-1/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.