Hi, I attended the assessment centre successully a few months ago. The case study was mostly common sense, but there were quite a few figures involved. I think the fact that I played with the figures a bit and tried to use them to support my argument stood me in good stead; other candidates were giving me funny looks for using the calculator. There was a team exercise in the morning which was actually quite fun - just lateral thinking basically, the usual tests, and an interview, which consisted of running thru my CV and a bit about how you'd keep a client on board in the course of a project. Can't really think of much else, hope this helps and best of luck.