It isn't only the British who get their own geography wrong!
Geography as it is taught in many countries today deals with phenomena such as earthquakes, storms etc. Political geography is not taught and many school-children asked by me or other teachers to describe their summer holiday trips have had no idea where Austria, Italy, Spain etc are or what the capital cities are called.
The myth from our childhood that Germany has two cities called Frankfurt has been replaced by there only being one. Children have looked at me in disbelief when I pointed out that there are Frankfurt am Main, (the one they call Frankfurt as do journalists) Frankfurt am Rhein and Frankfurt an der Oder.
Even in our schooldays, our main knowledge of what countries and cities are where derived from history lessons rather than geography.