KembaraXtra - Legal Terms - Slip Rule

The slip rule permits a court to correct an accidental error or omission contained in a judgment or court order without requiring the affected party to bring an appeal. It is principally concerned with mistakes arising in the recording or expression of the court’s decision rather than errors in the reasoning or substance of that decision. Examples include typographical mistakes, incorrect dates, mathematical errors, omitted words, or wording that fails accurately to reflect what the judge intended to order. The rule enables the formal court record to correspond with the decision that was actually made.

In civil proceedings, the slip rule is contained in Part 40 of the Civil Procedure Rules. A correction may be made by the court on its own initiative or following an application by one of the parties. The power may generally be exercised at any time, even after the order has been sealed or the ordinary time for appeal has expired. This flexibility reflects the principle that an obvious accidental mistake should not remain permanently embedded in a judicial order merely because of procedural technicalities.

The rule is limited to accidental slips and omissions and cannot ordinarily be used to reconsider the merits of the dispute. A judge cannot rely on the slip rule simply because the court later changes its mind, concludes that its legal reasoning was wrong, or wishes to substitute a materially different decision. Substantive errors must normally be challenged through an appeal or another appropriate procedural mechanism. The distinction between correcting expression and changing substance is therefore essential.

A typical example would be an order awarding damages of £25,000 where the judgment and calculations clearly show that the intended amount was £52,000. Another example would be the accidental omission of a party’s name or the inclusion of an incorrect deadline inconsistent with the judge’s oral ruling. In such cases, the court may amend the written order so that it accurately reflects the decision previously reached. The correction does not amount to a fresh determination of the case.

Criminal courts possess related powers to correct sentences and orders within prescribed statutory periods. The Crown Court may alter a sentence or another order within the period allowed by sentencing legislation where correction is necessary. This power enables obvious mistakes to be addressed promptly without the delay and expense of appellate proceedings. It must nevertheless be exercised within its statutory limits and cannot be used as an unrestricted power to resentence an offender.

The slip rule promotes accuracy, efficiency, and fairness in the administration of justice. It recognizes that judges, lawyers, and court staff may make clerical or accidental mistakes even where the underlying judicial decision is clear. By permitting straightforward correction without an appeal, the rule conserves court resources and prevents parties from suffering consequences caused solely by errors in documentation. At the same time, its narrow scope protects the important principle of finality in litigation.