A science teacher who secretly filmed shocking scenes of pupil misbehaviour for a Channel 4 documentary was found guilty of unprofessional conduct today.

A General Teaching Council panel ruled that Alex Dolan, who also exposed apparent attempts to dupe Ofsted inspectors, breached the trust of pupils and abused her position while recording secret footage at four schools in London and Leeds in 2005.

In its judgment, the panel said it did not accept that the public interest issues raised by the film justified the use of covert filming.