being slightly flippant. Even as a child I was an early riser. I would hated to have had to go to school later. At one point, living outside the UK, I started school at 8.00am and finished at 1.00pm., with only one short break. I loved it. On the other hand Finland has little or no light in winter and little or no dark in summer. Does this affect things?
A number, 3,4,9, seem fairly common in the UK
8, is in the lap of the gods, whether teachers stay in a school long term. Apart from the atmosphere in the school, it depends on the availability of the right staff. I can remember in one school year having 4 not very good teachers in one subject until the right person was found, the same happened to DC and from talking to my DDiL, something similar happened to one of my DGC - and they still have some years at school to go.
I am very ambivalent about starting school later. What exactly does it mean? Nothing until 6 or 7? Simply calling child educational provision under the age of 6 or 7 something else. Children going into separate institutions at 6 or 7 like the primary/secondary divide.
We are a family of self-taught very young readers and that that caused problems when both children started school. Fortunately, in both cases they were in a group with one or two other children. Both groups were moved into a higher class, which solved the problem for the reception class, but then caused problems when decisions had to be made about leaving them in another class for 2 years. What happens to children like that, if they do not start school until they are 6/7?