Trying to understand our national identity outside of closing our eyes and picturing red post boxes and the BBC logo is something the British do, I say, on a regular basis - daily, around 11 o'clock, with a slice of Victoria sponge cake and a cup of tea. But what exactly defines one's nationality? Is it tradition? The food we eat? The customs which we inherit? Three colours on a piece of cloth billowing in a spring breeze? If you're having a national identity crisis, just follow the simple flowchart below.