A documentary to be screened tonight offers a withering portrayal of the education system.It shows pupils swearing in class, searching for porn on the internet, assaulting each other and refusing to co-operate with or respect their teachers.After a 30-year gap from teaching, a supply teacher using the pseudonym Sylvia Thomas returned to 14 secondary schools in London and the North over an eight-month period.She secretly filmed her experiences using a camera hidden in her briefcase and a microphone disguised as a jacket button.Her experiences, chronicled in Classroom Chaos on Channel 5, will disturb parents who already suspect that their children are receiving a far from perfect education. At the end of her first day, the teacher describes how she went home and "sobbed my heart out, thinking: 'Is this what education has come to?' "
