Interesting, I didn't get a phone call to book my phone interview, I did it online. I'm pretty sure I didn't get any ATC scenario questions in the phone interview either. Their recruitment seems to be evolving before our eyes, either that or one of your friends is winding you up
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Fatty182 is right, just be yourself. You're either right for ATC or not. There's no point getting into the job because you've faked it and then not making it through the training.
Just out of interest dncn1, what stream did you apply for, en-route or tower?