The killer of special needs teacher Jane Longhurst is promoting a strangulation web site from his prison cell.

Graham Coutts, jailed for life for murdering Miss Longhurst, recommended the site to a woman writing to him at top security Whitemoor Jail, Cambridgeshire.

The site includes a photograph of a naked woman swinging in a noose.

The 35-year-old musician, who has admitted an obsession with necrophilia and addiction to strangulation sex, wrote: "It's not exactly quantum physics! You know what you like and what you want. You just have to pick the right person to safely indulge in."

Miss Longhurst's mother Liz today spoke of her shock that Coutts was still apparently obssessed with sick websites.

She said: "I'm appalled that the law apparently allows this to happen.

"I don't feel his best interests are being served. He's got 30 years in there and he can't be sick.

"He has quite a good brain that has been twisted around. He should be doing something positive with it, not harping on about these websites.

"I think it's dreadful."

Brighton Pavilion MP David Lepper said he would be referring the case to Home Secretary David Blunkett if it emerged there was a loophole in the law allowing perverts to send sick letters about strangulation websites from their jail cells.

A spokesman for the Prison Service said: "Category A prisoners have all their communications monitored 100 per cent.

"But if they don't break the law and the recipient is okay for them to be sent, then that is different."