Hello to everyone!
To Oddbob: I think that english is very important and a MUST to become an ATC. Although this, I think that it doesn't matter if you make mistakes during your speech. I think that they want to test your expression, if it's understandable, and how well do you develop in an english environment. I know people from Spain who arrived until the interview, and they didn't have BRITISH-AMERICAN english pronunciation, and they passed phase 2. This is only what I think. I'm waiting for a date to attend PHASE 1, and there I'll see what it's needed, so
this is only my opinion. Maybe a person who went to EUROCONTROL or other ATC's organisations/service providers could tell you the "real truth". Anyway, good luck if you go there
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Cheers