The journal reporting the EIU findings is using "expatriates," not EIU so there is no skewing of the actual survery in that regard (if your meaning is English speaking countries.)
Besides, the word is in the
American Heritage Dictionary:
ex·pa·tri·ate v. ex·pa·tri·at·ed, ex·pa·tri·at·ing, ex·pa·tri·ates. v. -tr. 1. To send into exile. See Synonyms at banish. 2. To remove (oneself) from residence in one's native land. v. -intr. 1. To give up residence in one's homeland. 2. To renounce allegiance to one's homeland. n. 1. One who has taken up residence in a foreign country. 2. One who has renounced one's native land. adj. Residing in a foreign country; expatriated. -ex·patri·ation n.
(no mention of Britain, hmmm?)
As I said, they are using the No. 2 definition -- I don't believe they are using No. 1