Well, after a bit of hunting, I couldn't find anything like what I wanted, so I designed this. I am sure someone must have done something far better, but I didn't know where to find it! In case of copyright, the map was from www.mapsofworld.com.
I had great fun with my 4 year old making predictions about which country would win each match and who would be in the final. It has really improved his knowledge of flags and general interest in where the countries are on the map.
I hope someone else will be able to use it too! It is in powerpoint format, so you can copy and move the flags around as you like, but as such, I don't know how to share it on mumsnet. Can anyone shed light?