The London Court of International Arbitration (LCIA) has announced its "landmark decision" to publish its reasoned decisions on challenges to arbitrators. No other major arbitral institution publishes reasoned decisions. The LCIA's decision represents an extremely significant development in the international arbitration community. This article explores the importance of publication of such decisions generally for users of international arbitration, by reference to existing standards and guidelines. In particular, it examines independence and impartiality, the IBA Guidelines on Conflicts of Interest in International Arbitration, differences in approach between the IBA and the ICC, and the LCIA decision to publish reasoned challenge decisions.