India has the world's highest number of English speakers (and one of the prominent dailies, The Times of India, is the highest circulated English newspaper in the world) - both probably because of the sheer size of the population.
Anyway, in my travels across India, and interactions with the sizeable "urban educated middle class Indian", as one of them described himself, one regular refrain stood out:
That a lot of people who say English is their native language - Brits, Americans, Aussies etc - do NOT really speak it correctly; and even among those who speak correctly, a large number cannot WRITE English correctly, i.e. they make a lot of grammatical and spelling mistakes. Syntax is poor. One manager I met said he was appalled that his (Western) superior couldn't draft out a simple one page letter correctly, and he had to be frequently called to re-write the whole thing.
I'm not getting into the British vs American English debate, just pointing out something interesting.