I don't think I've ever really encountered any doctors from the EU, either as a student/working, or as a patient. Have had a few issues with a couple of Asian doctors, most of all one of the ones I was working for last year - I used to take twice as long to transcribe his tapes as I did for anyone else as they were so incomprehensible. It's perfectly possible (though I tried everything to make them as accurate as I could - checking against notes, checking the BNF for drugs, checking medical dictionaries and even my own anatomy notes!) that I made mistakes in my typing that could potentially be dangerous. I think that there is a strong argument for an oral English test as well as a written one.