The new Supercard is essentially the same as the old Supercard, but with one big difference. Travelex has swapped providers, choosing Mastercard to set its exchange rate. The reason for this, Travelex says, is that the Mastercard rate was better 82.5 percent of the time than Visa's offering across 45 currencies.

It still means there are no application, registration or payment fees and you'll be able to monitor your spending via the companion apps, which are available on both iOS and Android. You can also register your new Supercard via these apps, which is then sent via post. As soon as it arrives, add your existing debit and credit cards and you're ready for fee-free spending abroad.

To make some money, Travelex does impose a 3 percent charge on ATM withdrawals made abroad. Also, if you use it in the UK, you will be charged £1 plus one percent of the transaction value. The Supercard is designed to be used abroad, so this shouldn't come as much of a surprise.