Jon Platt has become a leading figure in a campaign by parents
to relax the rules governing term-time holidays.
He took his daughter on a family holiday to Disneyworld in April 2015,
without her school's permission.
After Mr. Platt refused to pay a fine of 120 GBP,
the Isle of Wight council prosecuted him.
It said he'd failed in his legal duty to ensure that the girl attended school regularly.
However, magistrates accepted Mr. Platt's argument that
even with this and other absences,
his daughter had been in class for at least 90% of school days,
and that it amounted to regular attendance.
They've asked the High Court to decide whether they were right
to take the girl's wider attendance into account
in deciding in his favour.
Mr. Platt says that what's at stake at the High Court today
is parents' freedom to decide what's best for their children.
Well, ultimately, it boils down to who decides what's best for their children,
is it the local authority, or is it the parents?
For me, it's that easy: it's me. I know what's best for my kids,
it's not ideal, I know it's never ideal to take your children out of school on a term-time holiday,
but if you can't get away...you know,
there's lots of people who just cannot go in holiday time.
Headteachers were once able to let parents take children out of school
for two-week holidays.
Regulations introduced in 2013 now prevent them from doing so except in exceptional circumstances.
The Department for Education insists that even a day's absence
can damage a child's education.
Robert Pigott, BBC news.