Abstract:
A mixed international arbitration involves parties from two different States. The parties agree on the applicable law, which is the substantive law to be applied by an arbitral tribunal. The seat of arbitration, however, also plays a fundamental role by elucidating the applicable procedural rules. This is the lex arbitri. Sometimes arbitrators can find it difficult to determine which law is applicable to which issues. This was the case in LHDA v Impregilo1.