Czech Republic v Diag Human Se

On a challenge to an investment-treaty arbitral award under ss.67-68 of the Arbitration Act 1996, a party generally loses the right to object where it failed to raise the complaint promptly during the arbitration (s.73), so that most jurisdictional and procedural objections are barred; but a discrete serious-irregularity / fair-hearing complaint may still succeed where the tribunal denied a party a fair opportunity to be heard.