This article analyses that part of the judgment of Leggatt J in Astor Management AG v Atalaya Mining plc which deals with the enforcement of an ‘all reasonable endeavours’ obligation to reach agreement with a third party. It finds the decision to be robust and commercially pragmatic because of the judge’s willingness to give meaning to a contractual clause agreed upon by the parties and his reluctance to second-guess a commercial party on matters of commercial judgment.