Now let’s assume you have given consent to an app to get access to your account data at Lloyds and maybe your savings account at Nationwide building society, and the joint account you have with your partner at NatWest. The idea behind open banking is that apps (which must be FCA-regulated) will be able to “aggregate” everything in one single at-a-glance screen, constantly sweeping your accounts, helping you budget, spotting where you can make more savings, allowing you to more easily switch money from one provider to another, even analysing your gas bill to tell you of a £125 saving and doing all the switching work for you. It sounds great - until it goes wrong.