Resplendent in an expensive-looking waistcoat and shirt combination, Antony Jenkins looks very much the model of a successful banker. I only mention that because the fintech entrepreneurs I tend to speak to are more likely to be sporting quarter zip jumpers or t-shirts under jackets, rather than the more formal attire beloved of banking executives. But Jenkins has a foot in both worlds. Having spent three years as CEO of Barclays Plc, he is now in the driving seat at financial technology...