http://www.bbc.co.uk/news/education-39504338
"In her judgement, Lady Hale said it would cause unacceptable disruption if parents were able to withdraw children whenever they wanted.
"Unauthorised absences have a disruptive effect, not only on the education of the individual child, but also on the work of other pupils, and of their teachers," she said.
Allowing parents to decide when they took their children away would be a "slap in the face" to parents who kept the rules, said Lady Hale."