Last time I looked, 35% of the world population spoke English (about 104 countries). The majority of which speak British English. I don't know about you, but if Windows can support numerous minor variants of languages such as Chinese, etc. then surely the most common variant of the top speaking language should be supported 'out of the box'. It might not matter to America, but it does the rest of the world. You wouldn't like me to force you to write 'colour', 'personalise', and 'cancelled', would you?