Peter Sutcliffe is seeking a release date from prison on the grounds that he was wrongly convicted of the murder of 13 women because he was suffering from image paranoid schizophrenia at the time of his crimes.

The High Court was told yesterday by Kevin Murray, a consultant psychiatrist at Broadmoor secure hospital, that Sutcliffe had been wrongly convicted of murder.

Sutcliffe, 63, will learn within months the minimum time that he must spend in custody before he can be considered for parole. A judge at his trial in 1981 recommended 30 years, which would have made him eligible to apply for release in January next year, but no formal tariff was set.

It might form the basis of an appeal against the convictions for murder on the ground that Sutcliffe was suffering “diminished responsibility” at the time of the crimes, so should have been found guilty of manslaughter.

Anyone who murders is obviously insane, if even for that split second in which they become a killer – because no “normal” person would commit such an act. There is no contrition from Sutcliffe, no remorse or recognition for the atrocity of his evil deeds. I have seen very accomplished liars in court, and I bet Sutcliffe is just as cunning, and that he can convince himself about what the “truth” is, and hoodwink others, including experienced medics, into thinking the same too.