in attempt to get my brain round the staggering price increases, I had a good look at Royal Mail's new price leaflet and found that according to them, Greenland is larger than South America:
Now I do know that applications like Google maps use the Mercator projection because it is easiest to calculate when you want to zoom in and out of maps. However, in my opinion, if you display a static map like this there is simply no excuse for using it. It distorts the relative importance of various parts of the world and is thus offensive to anybody who cares about such "small" places like Africa and South America.
The full leaflet with the offending picture is also online as a PDF file.