# European Union (Withdrawal) Act 2018, Paragraph 3

Extent: E+W+S+N.I.

(1) Where it is necessary, in legal proceedings, to decide a question as to—
(a) the meaning or effect in EU law of any of the EU Treaties or any other treaty relating to the EU, or
(b) the validity, meaning or effect in EU law of any EU instrument,
the question is to be treated ... as a question of law.
(2) In this paragraph—
...
“treaty” includes—
(a)any international agreement, and
(b)any protocol or annex to a treaty or international agreement.

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Source: https://www.legislation.gov.uk/ukpga/2018/16/schedule/5/paragraph/3 (the official version)
Page: https://openlegislation.uk/european-union-withdrawal-act-2018/schedule-5/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.