The mother of murdered music teacher Jane Longhurst took her campaign to ban violent pornographic web sites to national television yesterday.

Liz Longhurst, 74, appeared on ITV's This Morning to promote the campaign she launched after Jane's murderer, Graham Coutts, was jailed for life at Lewes Crown Court in January last year. She thanked the 35,000 people who had signed the petition, many of them readers of The Argus.

Coutts's obsession with images of violent sex on the internet led him to strangle Jane, 31, at his Hove flat in March 2003.

Plans for a new law banning possession of extreme pornographic material downloaded from the internet were unveiled last week.

The petition will be submitted before December as part of a consultation before the legislation is introduced.