An umpire cannot widen the area of his jurisdiction by holding, contrary to the fact, that the matter which he affects to decide is within the submission of the parties." (b) Dalmia Dairy Industries Ltd. vs National Bank of Pakistan (supra) where the enforcibility of the award made by a sole arbitrator pursuant to an arbitration clause contained in the document of guarantee executed by the National Bank of Pakistan in favour of Dalmia Dairy Industries Ltd. was resisted by the Bank inter alia on the ground that the arbitrator was not entitled to decide the question of his own jurisdiction when the validity of the contract of guarantee 499 itself was disputed, and the Court of Appeal at pages 292 293 of the Report observed thus : "Whilst we recognise that in answering issue I(B) differently from the learned Judge we are rejecting this preference on this issue Mr. Sikri 's evidence rather than that of Mr. Lall, we reach our conclusion for the reason that we find nothing in the learned Judge 's judgment or in Mr. Sikri 's evidence or in the Indian authorities, which seems to us justify departure from the logical conclusion that there is no difference in principal between a contract containing an arbitration clause admittedly concluded but void for initial illegality and a contract containing such a clause admittedly concluded but where it is alleged that either the contract or the arbitration clause or both have become void because of subsequent illegality.