Brissyboy: I was on the interview board for ATCs about 2 years ago. I did a week's worth of interviews, around 30 people. We recommended 3 of those.
Take from that what you will.
You're not a shoe in. Re-read what people have posted about the interview. As Gemmy pointed out, things have changed. Listen closely to what they tell you at the beginning of the interview. Be specific in your answers.
Best of luck.
Cheers,
NFR.