FinTech entrepreneur Peter Ramsey is carrying out an investigation into just how well the UK’s leading challenger banks stand up against their traditional counterparts in terms of customer experience. How? Simple, he set up 12 bank accounts and directly compared how the banks performed as he attempted to open an account, make a payment, freeze a card, etc. So, are the challengers just clever marketeers or are they truly outperforming their established competitors? And what is ‘built for Mars’?