A drama teacher who watched as two teenage pupils had sex in the back of his car has been jailed for three years

Police also found caught him with photographs of girl pupils, including one of a 15-year-old in just her underwear, the Daily Express reported.

William Drury had engaged pupils in graphic classroom chats, at one stage encouraging a 16-year-old girl, with whom he had become infatuated, to pair up with a 17-year-old student.

He himself had molested the girl and had persuaded her to take off her bra and pose for topless photographs.

Drury had invited the girl and the boy to his house in Halifax for dinner. As he drove them home he encouraged the girl to perform a sex act on the boy as he stopped the car and watched.

He was arrested in September 2008 after students saw indecent pictures on his computer.

The married father of two was found guilty of a series of sexual offences in after a two-week trial.

The charges included inciting the pupils to have sex, engaging in sexual activity with a child by a person in a position of trust and making indecent photos of a child.

Judge James Spencer QC at the Leeds Crown Court sentenced him to three years in jail on November 14.

He was also banned from working with children for life and told to sign the sex offenders' register.