I agree that the start of the week is Sunday, and if you think about it, Greenwich meantime goes by Sunday I think as well as we do the clockcks Saturday night to start the new time on Sunday.

One thing I have that perhaps backs that up is my weekly tablet box, which is a seven day week and starts on Sunday and ends on a Saturday. I have calenders that start both on a Sunday and a Monday. I have to admit though I have never really thought about it much before. I have always gone by Sunday as the start of a week.