Laino,
Just read back over this Thread & there will be plenty of advice for your Behavioural Panel Interview. 3 people will be on the panel.
It will run for approx 45mins. It is based on the STAR technique. Suggest you google STAR Interviews. It was the best advice I was given on this thread.
I suggest you also arrange a visit to an Air Traffic Tower/Enroute facility. This is good prep for the Interveiw, as they tend to ask if you have down this.
The only advice I could give is learn to be VERY VERY Patient.. :-). A lot of us applied back in Aug/Sept last year & our referees are only just being contacted now !
Good Luck !