I've recently bought an iPhone 4S (in Spain) and have changed the language settings to English (UK) and the keyboard settings to British English. However, every time I go to use the keyboard it uses US English, so 'neighbour' is changed to 'neighbor' (and in some cases it doesn't recognise British colloquialisms, which I know Apple do, as I have an iPad which works with BrEng, and lets me type them). It's set exactly the same as on my iPad so I haven't the slightest idea what I've done wrong or how to change it. You might not think it's important but I prefer to use BrEng, and I'm fed up of seeing a red squiggly line under 'colour'!
Added (1). The keyboard is already set to BrEng, by the way. Every single setting concerning language is set to UK English, or British English.
Read more: Setting my iPhone 4S to British English?