If you're outside the UK, you're unlikely to have heard of Monzo. It's a so-called challenger bank, one of the several startups attempting to disrupt the banking industry in the UK. It's all based around its excellent app – there are no branches. It's pretty popular, too, with the majority of my London-based friends seemingly signed up for the service.

To begin with it was just a prepaid MasterCard that you would need to top up from your normal bank account. The benefit of doing so is that the Monzo app is great for budgeting, monitoring spending, and quickly paying friends.

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