WTO rules

I have always found economics to be rather boring and best left to those who enjoy and understand such things. In these difficult days, however, we inhabitants of this this sceptered isle are now meant to understand the minutiae of common markets, World Trade Organisation rules and so on. This mug, made in Stoke on Trent England, decorated with Scottish Sheep and full of South African Rooibos tea is as near to an understanding as I am likely to achieve!