06:00 purely to avoid traffic. 30-35 mins travel time leaving this early. I can go in later (latest start is 08:30), but that just means catching the worst traffic and then I have to sit at the office until 17:00. Getting in early allows me to leave at 16:00, but that doesn't really mean much because it is still an hour sitting on the N3.
Bastards are taking WFH on Mondays and Fridays away from us next month, so the small QOL I had not having to be up at the crack of dawn a couple of times a week is gone.