News that the CEO of Barclays has fallen victim to an email prankster is an unfortunate reminder that it is not only sophisticated attacks that threaten the cyber security of finance's biggest institutions, experts have warned.

Professor Richard Denham, chairman of the National Cyber Management Centre, told FN that everyone within an organisation can be caught out by such tricks, including those in C-suite roles at the very top. He said: "Boardroom members are not immune to be vulnerable to pranksters."