One of the European Central Bank's chief supervisors has warned banks against trying to "game the rules", something that regulators are becoming more wary of in the light of Brexit.

In a speech to the European Money and Finance Forum (Suerf) in Helsinki this morning, Danièle Nouy, chair of the supervisory board of the ECB, addressed the issue of regulatory arbitrage — where banks or other financial firms take advantage of rule differences between jurisdictions or types of institution.