Barclays Bank plc v O'Brien

Barclays Bank plc v O’Brien [1993] UKHL 6 (21 October 1993) is an English contract law case relating to undue influence. It set out the basic categories of undue influence as: (1) actual undue influence (2A) presumed undue influence from a special relationship (2B) presumed undue influence from readily ascertainable facts raising suspicion of undue influence.