This Practice Note considers with how to apply to the arbitral (arbitration) tribunal for the correction of mistakes or errors in an arbitral award (the slip rule) whether they be typographical, computational or clerical under section 57 of the Arbitration Act 1996 (AA 1996) as amended by the Arbitration Act 2025 (AA 2025). It sets out the timescale for making an application (or applying) for correction of mistakes or errors (and extensions of time that may be permissible) and gives case law examples of successful and unsuccessful applications for corrections under the slip rule (AA 1996, s 57(3)). AA 1996, s 57(3)(a) provides a tribunal with the power (jurisdiction) to correct an award so as to remove any clerical mistake or error arising from an accidental slip or omission or clarify or remove any ambiguity in the award. This process (procedure) may be referred to as: a remedy for an inadequate award under English law; applying to amend or for an amendment to an award; errors or mistakes with awards.