Dispute Resolution analysis: Where an application for judicial review relates to a decision made by the Secretary of State or a local planning authority under the planning acts, the claim form must be filed not later than six weeks after the grounds to make the claim first arose. However, this rule is not absolute for a judicial review claim and the court has powers under Civil Procedure Rule (CPR) 3.1(2)(a) to extend the time limit. In contrast, the relevant legislation for statutory reviews do not permit the period to be extended at all. Where the time limit has already expired for a planning judicial review, the claimant must apply for an extension of time in the claim form. The application will then be considered by the judge at the same time as deciding whether to grant permission to apply for judicial review. In giving judgment Robert Palmer KC, sitting as Deputy Judge of the High Court, confirmed that the court in determining whether to grant an extension of time will apply the principles set out in R (Thornton Hill Hotel) v Thornton Holdings Ltd. In particular, the judge emphasised the importance of the claimant to proceed with the ‘greatest possible celerity' because a landowner is entitled to rely on the validity of a planning permission granted by a local planning authority exercising its statutory functions in the public interest. Accordingly, where third parties have had a fair opportunity to become aware of, and object to, a proposed development they are expected to move swiftly to challenge its lawfulness before the court. He also noted that when faced with an application to extend time for the bringing of a claim, the court will seek to strike a fair balance between the interests of the developer and the public interest. This includes the extent of hardship or prejudice likely to be suffered by the landowner or developer if relief is granted, compared with the hardship or prejudice to the claimant if relief is refused, and the extent of detriment to good administration if relief is granted, compared with the detriment to good administration resulting from letting a public wrong go unremedied if relief is refused. Written by Brendon Lee, partner at HCR Hewitsons.