He was responding to an interview Hindley gave to The Independent earlier this month, in which she said she took part in the crimes only because she was sadistically abused by Brady.

She said he had also threatened to kill members of her family.

But Brady tells the Home Secretary, Jack Straw, she has a "fertile, but flawed imagination" and calls her a "chameleon".

Rejected: Hindley's interview with The Independent

In October, Hindley's lawyers will take her case to the Court of Appeal. They will argue that Home Secretary Jack Straw should not have the power to keep her in prison for the rest of her life.

But in a counter-blast, Brady rejects her version of events more than 30 years ago.

He refers to her allegation that he whipped her. She told The Independent that the discovery of photographs showing her injuries could now form part of her appeal.

But Brady writes: "Her fertile but flawed imagination fails to take account of inconvenient, documented fact. Namely at the trial the then Attorney General, Sir Elwyn Jones, questioned her about a series of pornographic photographs she had willingly posed for, for sale, one apparently showing 'whip marks'."

'Irrational hypothesis'

"She had already explained to psychiatrists that the 'whip marks' had actually been drawn with lipstick. Any amateur photographer can immediately detect that the 'whip marks' are perfectly flat lines, not raised welts.

Brady goes on: "For 30 years she said she was acting out of love for me, now she maintains she killed because she hated me - a completely irrational hypothesis.

Hindley: She's a chameleon, says Brady

"Myra Hindley is a chameleon who simply reflects whatever she believes will please the person she is communicating with, flattering them. She can kill both in cold blood and a rage."

Brady says that his 500-page autobiography is now locked away in a vault, with instructions that it should only be published after his death - or instructions to the contrary.

He says he is willing to be injected with the 'truth drug' sodium pentothal and questioned about the allegations made by Myra Hindley.

"It is fashionable nowadays to blame one's faults and crimes on abuse as a child," he says.

"I had a happy childhood. But Myra Hindley's allegations obviously are framed to exploit a variation of the theme."

Brady concludes his letter by saying he wishes it to be issued for public, court and Home Office record.