"[49]... the fundamental if unarticulated premise underlining the decision in Hemain is that, where there are parallel proceedings in two different courts, fairness requires that neither party should be permitted to litigate the substantive issues in either court until such time as both courts, having disclosed of any preliminary issues as to jurisdiction, are ready to embark upon a consideration of the substantive issues..." and later: 14. "[55]... what in principle justifies the grant of such an injunction is not so much the assertion that England is the natural forum, but rather the forensic advantage that the other spouse unfairly seeks to gain by disputing that England is the appropriate forum (and thus holding up the English proceedings), whilst at the same time treating himself as free nonetheless to pursue his own proceedings abroad. The purpose of a Hemain injunction is to prevent one spouse stealing a march on the other by manipulating the two sets of proceedings to his own forensic advantage. Whether or not that is in truth what he is doing, and whether or not the case for the grant of a Hemain injunction is thus made out, turns in the final analysis not on questions of forum (non) conveniens, nor on the question of whether or not England is the natural forum, but on whether, at a time when typically those questions have still to be resolved, the spouse who it is sought to injunct is conducting the litigation – the two sets of proceedings – to his own forensic advantage and, more particularly, in a manner that can properly be characterised as vexatious, oppressive or unconscionable."
"The principle of separability enacted in section 7 means that the invalidity or rescission of the main contract does not necessarily entail the invalidity or rescission of the arbitration agreement. The arbitration agreement must be treated as a "distinct agreement" and can be void or voidable only on grounds which relate directly to the arbitration agreement. Of course there may be cases in which the ground upon which the main agreement is invalid is identical with the ground upon which the arbitration agreement is invalid. For example, if the main agreement and the arbitration agreement are contained in the same document and one of the parties claims that he never agreed to anything in the document and that his signature was forged, that will be an attack on the validity of the arbitration agreement. But the ground of attack is not that the main agreement was invalid. It is that the signature to the arbitration agreement, as a "distinct agreement", was forged. … ."
"Section 7 of the Arbitration Act 1996 reproduces in English law the principle that was laid down bysection 4 of the United States Arbitration Act 1925 . That section provides that, on being satisfied that the making of the agreement for arbitration or the failure to comply therewith is not in issue, the court shall make an order directing the parties to proceed to arbitration. Section 7 uses slightly different language, but it is to the same effect. The validity, existence or effectiveness of the arbitration agreement is not dependent upon the effectiveness, existence or validity of the underlying substantive contract unless the parties have agreed to this. The purpose of these provisions, as the United States Supreme Court observed in Prima Paint Corp. v Flood & Conklin Manufacturing Co (1967) 388 US 395, 404 is that the arbitration procedure, when selected by the parties to a contract, should be speedy and not subject to delay and obstruction in the courts. The statutory language, it said, did not permit the court to consider claims of fraud in the inducement of the contract generally. It could consider only issues relating to the making and performance of the agreement to arbitrate."