If you're not the lucky owner of this football coin, don't worry. There's an entire cache of potentially valuable coins that could be lurking forgotten in your attic. Take for example a rare 1933 ...

You might assume a £2 coin is only worth its face value, but don't be fooled. One such coin has been valued at an eye-watering £1,434, so it's time to start digging through your spare change.