A former teacher at a London school has been jailed for historic child sex abuse.

Richard Alston, 70, was found guilty of gross indecency with a child and indecent assault on a child.

He had been a teacher at Cavendish School in Ealing during the 1970s, and was the partner of Paedophile Information Exchange founder Peter Righton. The group was set up in the 1970s and campaigned to lower the age of consent.

Together with his partner, the pensioner forced the youngster to watch pornography and then perform sex acts on him.

Alston was today sentenced to a total of 21 months in prison at Southwark Crown Court.

Alston met Righton - 19 years his senior - when he was just 16 years old and they spent some 40 years together.

Judge Alistair McCreath today said: "I acknowledge that at the time you committed these offences you were in a very close relationship with an older man who had very particular and aggressive views about the propriety of sexual behaviour with minors and whilst you had the intelligence, maturity and ability to say no I'm prepared to acknowledge that to some extent at least your behaviour was influenced by him."

Alston, of Vinery Road, Bury St Edmunds, Suffolk only nodded as the sentence was passed.