Are you bilingual in English?

Milky   Mon Oct 23, 2006 10:50 am GMT
We may, in due course, all need to be in control of two standard Englishes—the one which gives us our national and local identity, and the other which puts us in touch with the rest of the human race. In effect, we may all need to become bilingual in our own language. — David Crystal (1988: p. 265)