As my local o2 stores are part of shopping centers (fire exit, security guard issues etc) they're still opening at their normal time of 9am.
This means I either queue from 7 - 7:30, when I would expect the queue to start forming for an 8:02 opening (you can guarantee people will just assume it'll be opening at that time) or I chance my luck with everyone else on their way to work 😱