Yeah ... I thought it was because you're a bunch of control-freak nazis, with no sense of decency.
According to the Mail:
"Teachers fear the failure to secure consent is widespread because there is no requirement in law to gain active permission, and consulting parents at all is simply seen as 'good practice'.
The Association of the Teachers and Lecturers, meeting for its annual conference in Manchester yesterday, passed a motion demanding the union investigates the issue."