The process was veeery slow. They called me end of March to arrange the telephone interview which is with an external agency (some of the employees had an accent, connection was poor at times). After I passed this stage they asked me to attend the AC and I booked it for end of month. However few days before that they called to ask if it will be possible to move it two days later as there aren't enough assessors for this day. I agreed and then two days before the assessment day they call again explaining that it's not possible to attend the date I'm booked for as they need to do some additional security checks..... not professional at all..
On the assessment day we were given the schedule for the day. First was the group exercise where you are given time to read it tru and then need to discuss with the other members. As far as I remember we needed to agree either to outsource or not some/all the activities in company X. You need to reach a final decision with your group.
After that were the interviews- quite nice, one with an HR manager and the other with a manager to the position you're applying for.
Finally, I was given the presentation task - make sure you write down the key points & issues from the text they give you. It's important that you are keeping it consistent and be very clear about the solution you are proposing. I have been asked some challenging questions regarding some of the issues in the scenario.
They called me back 2 weeks after with a full feedback report on each of the components which was really useful