Very confusing posts op and I live in Scotland..
We have, ignoring private nurseries for now,
ELC early learning childcare for three year olds.
ELC for four year olds.
ELC for certain eligible two year olds.
As others have said, year runs 1st march to end feb.
Part of the confusion here MAY be that we now have guaranteed additional year funded nursery, ELC for any child born august to march.
So I could defer my oct 2018 child, to start at 5 years 10 months, rather than this year.
Benefits being nursery system more flexible.
We do not have pre school.
Your child is in nursery anyway, enrolment week for school was like November last year, so not just eight weeks notice.
Every child different, base the decision on your child with guidance from those who currently have them four days a week, not on what others are doing.