Hi KSD!
The assesment centre is pretty cruisy- you fill out some forms, then they sit you down and tell you all about DJ.
Afterwards, you get divided into small groups, where you have to make up the infamous song, with props etc. Then in groups of two you do a little improvisation thing.
I found it really good fun- everyone else who was there was fun and good to talk to. I think what they're looking for is team players; people who have ideas but don't push them too hard, and who can build up rapports with others quickly! I got through to round 2 (I was a bit shocked to make it that far), but fell down after that... so I'll be back for another crack at it in 6 months!
In the mean time: best of luck for it- have fun and you'll be sweet!
Cheers
En Avion