There isn't necessarily an interview but there is a test that you have to pass that test your grammar and your comprehension of the English language. There are videos on youtube that help with the preparation for the tests.

You are required to do a transcription. You are also asked basic English questions. These are to check your spelling, punctuation and, basically the understanding of the English language. You are then required to finish a transcription. The results of the test are never communicated with the applicant and you can only reapply after about three months.