Town and country planning – Development. The duty to co-operate with neighbouring planning authorities, in s 33A of the Planning and Compulsory Purchase Act 2004, did not end once there was disagreement and balancing matters where there had been co-operation against those where it had been absent was not the statutory test. Accordingly, the Planning Court dismissed the claimant local planning authority's application for judicial review of the decision of the inspector appointed by the defendant Secretary of State, finding that it had failed to comply with the duty to co-operate.