Hi, I had my interview there at the Stratford store two weeks ago and it really was quite chilled. Everyone was wearing quite formal dress, sixth form/ college type attire so I would definitely advise against wearing jeans. It was my first ever interview too but it was surprisingly relaxed. Before your interview you’ll be in a waiting room with other canditates for a good 20 minutes and it was clear that you were being watched. Make sure you interact with others and don’t go on your phone etc as this will come off really bad. In particular, don’t seem too shy or nervous as it was clear that other candidates didn’t really take much input from these characters during later tasks.The interview itself is calm, we were given a scenario and then simply discussed as a group how and in what order we would deal with incidents/tasks. Make sure you don’t come off too bossy, as assessors were visibly annoyed at this. For documentation, all I brought was passport copy and NI Number, this was fine (no birth certificate). Good luck!