1st of all, congrats for getting through to the assessment centre stage! Thats a wicked achievement in itself.
I'm one of a couple of people on here that has done the assessment centre in the past couple of years (I did mine in september 2009). To quote 1Charlie who posted this on a different thread earlier this year:
"Assesment Center is a product called 'Sure Select' designed by Airways, and I believe has been sold to Airservices, so most of the tests are very similar.
1. Aerodrome simulation
2. Radar simulation
3. Computer based testing (spatial reasoning, maths, short term memory etc)
4. Group exercise
5. Interview"
When I did the assessments this is exactly what happened, although they occur in a different order to the above (eg. I had the computer based testing 1st then the interview 2nd...nasty!!). The aerodrome simulation was good fun though-that was my favourite one.
I'm up in Tauranga tower so can't really organise a visit up chch tower, but if you don't have any luck getting in touch with anyone, fire me a pm and I'll get hold of the folks down there and see what I can toss up.