I work in a team of 3. I start at 8am, and I'm at work by 7.40am every day (to ensure I have time to eat my breakfast and have a coffee!). One of my colleagues starts at 9am, the other at 9.30 (her times were changed because she couldn't manage a 9am start)
My two colleagues are late. Every day. 9am boy arrives around 9.20 (but often more like 9.30) and 9.30 girl arrives around 9.45/9.50. It drives me INSANE. My boss appears to either not notice or not care.
Now, when I first started this job, it used to bother me immensely that people were rarely on time, but I've since come to realise that people are often late in London due to public transport. We work right next to London Bridge station, and most people commute by train. I'm far more relaxed about it now. These two, though, are consistantly late.
Am I being unreasonable? Is it acceptable at your workplace to rock up 20 or even 30 minutes late every day? Sometimes they're so late that I'm not sure they're even coming in (9am boy turned up at 10.10 yesterday without a word of explanation for example). Maybe I need to chill out?