Second Circuit: Certain Underwriting Members of Lloyds of London v. Insurance Company
In business arbitration, party-appointed arbitrators are not limited by the usual tests of evident partiality; rather, a party seeking to challenge the outcome must establish by clear and convincing evidence an improper nondisclosure or a prejudicial impact on the award.
http://www.ca2.uscourts.gov/decisions/isysquery/406cb98d-3b23-41bf-b154-c6c24ff325e7/1/doc/17-1137-cv_opn.pdf#xml=http://www.ca2.uscourts.gov/decisions/isysquery/406cb98d-3b23-41bf-b154-c6c24ff325e7/1/hilite/
(Incertain members of Lloyds presumably limited to permissive intervention.)