`Under the statutory power expressed in s.5 of the Arbitration Act 1928 (Vict.) the Court or the judge, assuming that the other necessary conditions are fulfilled, must be satisfied that there is no sufficient reason why the matter should not be referred in accordance with the submission. This language might appear to place the burden upon the defendants applying for a stay. But the Courts begin with the fact that there is a special contract between the parties to refer, and therefore in the language of Lord Moulton in Bristol Corporation v. John Aird & Co., consider the circumstances of a case with a strong bias in favour of maintaining the special bargain or as Scrutton L.J. said in Metropolitan Tunnel and Public Works Ltd. v. London Electric Railway Co., "A guiding principle on one side and a very natural and proper one, is that parties who have made a contract should keep it." At the same time, as is shown by the two cases cited, the Court's discretion has not been restricted by any exclusive definition of the circumstances which will warrant a refusal of a stay: see per Lord Parker in Aird's Case, and per Scrutton L.J. in the Metropolitan Tunnel Case.'