A male au pair was so engrossed in the illegal movies he was watching he failed to see the child he was caring for standing next to him.

The Canterbury boy spent several seconds watching the vile abuse images – and later talked about it to friends at his school.

Teachers overheard the conversations and reported it to the authorities, leading to the arrest of Spanish-born Saul Aramburo.

But the perverted au pair told police he had no interest in child images - he just wanted to compare the size of his manhood with other internet users.

Prosecutor Jim Harvey told Canterbury Crown Court the 27-year-old had downloaded more than eight hours of vile sex abuse movies.

Aramburo, who has since moved to London, pleaded guilty to three charges of illegally accessing images up to level four and 41 movies and was jailed for eight months.

He was also ordered to sign the Sex Offenders' Register and banned from working with children for 10 years.

Judge Adele Williams told him: "One of the movies showed a child as young as six engaged in sexual activity.

"The mischief of this offending is that these are real children being really abused and the evil of this offending is that those who make these images and abuse these children do so because people like you download these images from the internet."