Fraus omnia corrumpit (fraud corrupts all; alternatively formulated as ex turpi causa non oritur actio) is not easily applied in conflict of laws. See an earlier post here. In  EWHC 251 (Comm) Sinocore International Co Ltd v RBRG Trading , the Commercial Court granted permission for the enforcement of a foreign arbitral award despite allegations that the transaction in question had been “tainted” by fraud: this is how the case is summarised by Mayer Brown and I am happy broadly to refer to their overview and analysis.
The Commercial Court’s relaxed attitude is another sign of strong support of the English courts for the New York Convention and its narrow application of ordre public.
An interesting case for comparative conflicts /arbitration classes.