Roger-Wilco, whilst I understand you are trying to be helpful, I would advise you to be careful what you post, even information such as that helps people feel more comfortable before their assessment, particularly your third line, you are potentially giving people who haven't attended assessment an advantage, every candidate should go in unaware of the structure, it's only fair, that is rather detailed information you have posted. On my day we were warned very specifically not to post any information about the day on forums such as these, and if we decided to do so, we risked being disqualified if BA could determine the identity of the poster.
Even if you are not in this selection process, in my opinion you should not be posting such information for such a competitive process.