Morison J in Fidelity Management SA v Myriad International Holdings BV

Under section 68(2)(d) of the Arbitration Act 1996 a tribunal commits a serious irregularity if it fails to deal with an issue that was put to it; an 'issue' for this purpose is a matter the resolution of which is essential to the decision, and a failure to deal with such an issue is to be distinguished from a failure to give adequate reasons or to address every argument.