BlackRock Assesment Center

Hi guys, I have an AC with BlackRock in London for PMG and I'd like to know if some of you had this experience before. There are no explanations of what's gonna happen that day on their email invitation so don't really know what to expect (GD, more interviews, more tests, tech interviews...). Thanks if you have any feedback.

PS: I've read a lot about PAG (Portfolio Analystics Group) in the US, but I never read about it for London's offices. Any insider info?