Like every other place in the world, the week starts on Sunday in London. See the related question below.
Yes, if your week starts with Sunday.
Sunday is usually the first day of the week on North American calendars.
Sunday is the first day of the week in British countries.
It doesn't have a fixed day of the week. Rather, it has a fixed day of the month: it starts on the 25th of Kislev.
It was a Saturday.
The first day in April was a Friday.
August starts on a different day of the week every year, but in August 2012 it started on a Wednesday. Otherwise it starts on the first every year!
July starts on a different day of the week every year. In 2012, it started on a Sunday.
The French week starts on Monday (lundi) and ends on Sunday (dimanche).
2011 starts on a Saturday.
Tommorow
Summer officially starts in the fourth week of June, specifically on June 21st or 22nd. This day is known as the summer solstice, marking the longest day of the year in the Northern Hemisphere.