A leading European politician who spent the best part of a decade helping to shape post-crisis financial regulation has warned that Brexit risks reversing much of what makes markets safer today.

MEP Kay Swinburne was speaking at an event in London where she and other high-profile financiers — including the chief executive of UK bank Standard Chartered and vice-chairman of Jupiter Fund Management — were discussing the state of financial markets 10 years on from the collapse of Lehman Brothers.