# Human Rights Act 1998, Paragraph 1


No one shall be held guilty of any criminal offence on account of any act or omission which did not constitute a criminal offence under national or international law at the time when it was committed. Nor shall a heavier penalty be imposed than the one that was applicable at the time the criminal offence was committed.

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Source: https://www.legislation.gov.uk/ukpga/1998/42/schedule/1/part/I/chapter/6/paragraph/1 (the official version)
Page: https://openlegislation.uk/human-rights-act-1998/schedule-1/part-I/chapter-6/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.