FORMER Charterhouse physics master Dean Johnson, who had sex in the classroom with a sixth former, has been banned from teaching for life.

Mr Johnson, 52, resigned his post in 2013 after the girl complained to the police. An investigation led to his conviction at Guildford Crown Court in 2015 for possessing extreme pornography, featuring women being hanged, suspended and strangled, and he was handed an eight-month prison sentence, suspended for two years.

The divorced father of three, who was married at the time, was banned last week by the Secretary of State for Education from teaching “indefinitely” in any school, sixth form college, relevant youth accommodation or children’s home in England and cannot “apply for restoration of his eligibility to teach”.

The decision followed a recommendation by the National College for Teaching and Leadership professional conduct panel, following a hearing earlier this month. It urged a prohibition with no review was required due to the “sexual misconduct found, the serious impact on “pupil A” and the lack of sufficient insight or remorse”.

The panel heard Mr Johnson had had an “inappropriate relationship” with the pupil, which started in January 2008 in her final year at Charterhouse and continued after she left.

When she was still at school, he shared sexual fantasies with her on Facebook and engaged in sexual activity with her in his car when he gave her a lift from the classroom to the dinner hall.

He gave her stockings and asked her to put them on for him in the classroom and had sex with her. He also filmed their sexual encounters on his mobile phone and a school camera.

The panel reported it was “particularly concerned to note that, in a sexual relationship founded on Mr Johnson exercising his influence as a teacher, he resorted to practices such as recording his sexual activity with pupil A.”

Responding to Mr Johnson’s subsequent conviction for possessing extreme pornographic images, the panel noted – but rejected – his claim it was “not relevant” as he viewed the material in private.

The panel also took into account references and testimonials submitted on Mr Johnson’s behalf, including a statement made by his wife, and representations made by his solicitors.

Recommending a lifetime teaching ban, it stated: “There is a strong public interest consideration in respect of the protection of pupils given the serious findings of an inappropriate relationship with a pupil. The panel has considered very carefully the serious and continuing consequences, both personal and in terms of her academic progression, which have beset pupil A as a result of Mr Johnson’s conduct as outlined in her statements.

“Similarly, the panel considers public confidence in the profession could be seriously weakened if conduct such as that found against Mr Johnson were not treated with the utmost seriousness when regulating the conduct of the profession. Finally, the panel considers a strong public interest consideration in declaring proper standards of conduct in the profession is also present as the conduct found against Mr Johnson is far outside that which can reasonably be tolerated.”