Not odd at all. If he learned British English from early childhood, or concurrently with French, he could plausibly speak it with no French accent. Since English (or whatever PC non-nationalist neutral name they gave it) is the common language of Earth, if not the Federation, it makes sense that it would be taught as part of a standard education.

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
Illuminati's Razor-The most complicatedly evil answer is usually the most correct answer. - Fazor
"Every book is a children's book if the kid can read." - Mitch Hedberg
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort