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From Wikileaks

Notwithstanding Rudolf Elmer's sense of threat and the nervous tension that must be a direct result of this, I have to confess that the level of English displayed in the corresondence that purports to be his is well below what one would expect from a very senior banking professional stationed overseas. Hard to tell whether this is all real.

[edit] About That...

His English appears to be fine for someone who probably doesn't have English as his first language. NB: In page 12 of the pdf under section 3.8.5

"English is not my first language"