Judicial Review – Error of law – Whether error of law need be ‘on face of record’ – Inferior tribunal and presumption of regularity – Failure of majority members of inferior tribunal to provide fulsome reasons for award made – Interpretation of contractual agreement – Parties’ discussions during contractual negotiations – Parties’ expressions of understanding of draft agreement as expressed during contractual negotiations – Parties’ expressions of respective interpretations of contractual agreement after agreement reached – Implied terms – Reference to custom and practice in interpretation of contracts.