An overview of undue influence in the context of property and finance transactions. This note discusses the categories of undue influence (as clarified in Royal Bank of Scotland plc v Etridge (No 2) [2002] 2 AC 773) and sets out when a bank is put on inquiry of the risk of undue influence. It also considers the consequences of finding out that undue influence was exerted in a transaction and provides an overview of alternative pleas.