I discussed the first instance judgment in Enka Insaat here and the Court of Appeal’s findings here. The Supreme Court’s judgment, Enka Insaat Ve Sanayi AS v OOO Insurance Company Chubb  UKSC 38 attempts to settle one of the many issues which choice of law in arbitration provokes, as I first flagged in a post on Sulamerica here: one needs to determine lex arbitri (the law that governs the arbitration agreement; it decides issues such as what issues are arbitrable, and whether the agreement to arbitrate is valid at all); the curial law or the ‘law of the seat’ (the procedural law which will guide the arbitration proceedings; despite the latin curia not commonly referred to as lex curiae); the ‘proper law’, the law that governs the actual contract (lex contractus) of which the agreement to arbitrate is only one part; and the locus arbitri and the lex locus arbitri: the venue of the arbitration and its laws, which may or may not interact with the proceedings. That 2013 post on Sulamerica contains many further references, including comparative ones. Further case-law may be found by using the search tag ‘Sulamerica’ on the blog.
The Supreme Court held 3-2 in favour of dismissing the appeal, but only on the facts. Lord Burrows dissented in part, Sales dissented. The Supreme Court has now effectively held that unlike the Court of Appeal’s suggestion, in the absence of express contractual provision there is no “strong presumption” of an implied term for the lex curiae, the law of the seat of the arbitration, to be the lex arbitri (the law that governs the arbitration agreement), instead pushing the lex contractus (of the agreement of which the arbitration agreement is part) as the lex arbitri.
There has been plenty of analysis since the 9 October judgment and I shall let readers find that for themselves (Google search ‘proper law arbitration Enka v Chubb’ should do the trick). Ex multi I found Peter Ashford’s analysis very useful, including his use of the term ‘host contract’.
As the discussion here shows, with 2 strong dissenters and open discussions on the determination of implied choice of law, I do not think judgment in Enka v Chubb has truly settled the issue. Per inspiratio Steven Barrett’s quote, this might be one of those authorities one can drive a coach and horses through.