Recent interview days
Regarding your queries for the interview day, I had mine back in March and found out soon after that unfortunately I hadnt made it through this penultimate stage!
My advise I can give you is dont over prepare for the technical interview by trying to learn as many Air Traffic facts as possible- they are testing your ability to think about logical solutions to various ATC scenarios you may be faced with. I would also say that they are testing how you react to situations generally- I was also asked to calculate how old I was in months for starters which certainly threw me of course abit!
Regarding the personnel interview- just be honest and open. Make sure you can give some good examples to back up your answers rather than just saying yes or no.
Good luck and keep plugging away- One day you may be able to plug in for real!