The UK's most dangerous prisoner, locked up 47 years ago, promised to kill again if he gets the chance

One of Britain's most dangerous serial killers has issued a chilling warning promising to kill again if given the chance.

Robert Maudsley has been in solitary confinement in a glass cell since 1979 and is the longest-serving prisoner in Britain, serving 47 years behind bars for the murder of four men in the 1970s.

So, Maudsley carried out his wave of justice by his own hand and even killed three of his victims while he was in prison.

In a shocking documentary 'HMP Wakefield: Evil Behind Bars', Maudsley's nephew, Gavin, reveals how his cultured, soft-spoken uncle is content to be in solitary confinement isolated from the rest of the world.

The serial killer says in a letter to his 40-year-old nephew that he is “happy and content alone” and warns that he will kill again if he is ever released.

Formerly known as 'Hannibal the Cannibal', it was rumored that Maudsley had eaten part of the brain of one of his victims in prison.

His violent crime story is inspired by both novels and films that tell the story of Hannibal Lecter.

While the rumor is not believed to be true, he has earned a reputation as one of Britain's most dangerous criminals.

Maudsley, 68, was jailed for the murder of 30-year-old John Farrell in March 1974.

While serving life in prison, he embarked on a sick wave of violence in which he murdered three men: David Francis, a convicted child molester; Salney Darwood, who was serving a life sentence for the manslaughter of his wife Blanche; and William Roberts, who was serving 7 years for sexual assault of a seven-year-old girl years.

The caged killer has been repeatedly rejected by requests to spend time with other human beings and has to live his days in a cell specially built for him.

Measuring 5.4 meters by 4.5 meters, the cell is constructed of bulletproof methacrylate and has compressed cardboard furniture.

He spends 23 hours a day in the cell, sleeping on a concrete slab and using a toilet and sink that are bolted to the floor.

Maudsley, known as 'Uncle Bob', from Toxteth, Liverpool, committed his first murder in 1974, when he was just 21 years old.

After fleeing to London, Maudsley started working as a prostitute. He then brutally murdered paedophile John Farrell in Wood Green London, after he showed him photographs of children he had sexually abused.

After the murder, he turned himself in to the police and immediately confessed to his crime.

He was deemed unfit for trial and was sent to Broadmoor Hospital, home to some of Britain's most violent inmates.

At first, he was a model prisoner and didn't get into trouble, but in 1977 he and his fellow inmate David Cheeseman locked themselves in a cell with child molester David Francis.

After a nine-hour ordeal of torture, Francis' lifeless body was hung up for the prison guards to see.

Maudsley was convicted of manslaughter and sent to HMP Wakefield.

In 1978, Maudsley strangled and stabbed Salney Darwood, 46, who had been imprisoned for killing his wife.

He hid Darwood's body under the bed before sneaking into the cell of paedophile Bill Roberts, 56, who had sexually abused a seven-year-old girl.

He stabbed Roberts, cut his skull with a makeshift dagger and smashed his head against a wall.

He was later sentenced to life imprisonment.

In 2000, he filed a lawsuit in court requesting that he be allowed to die.

In a letter he wrote at the time, he said: “What is the point of having me locked up 23 hours a day? Why even bother feeding me and giving me an hour of exercise a day? Who am I really a risk to?”

“As a result of my current treatment and confinement, I feel that all I have to wait for is a psychological breakdown, a mental illness and a probable suicide,” he added.

Elsewhere in the letter he also asked: “Why can't I have a parakeet instead of the flies, cockroaches and spiders that I currently have? Do I promise to love it and not eat it? Why can't I have a TV in my cell to see the world and learn? Why can't I have music tapes and listen to beautiful classical music?”

“If the Prison Service says no, then I ask for a simple cyanide capsule that I will gladly take and the problem of Robert John Maudsley can be solved easily and quickly,” the prisoner concluded.

According to Elliot Reed, director of the documentary in which Maudsley's latest threat was revealed, the prison where he is located is known within the prison system as the “Mansion of Monsters”, since it is said that the worst prisoners are thrown there and is home to some of the most violent men in the British criminal history such as Roy Whiting, Jeremy Bamber, Charles Bronson and of course Robert Maudsley.

“Through interviews with former prisoners, retirees and families of Britain's most infamous inmates, we opened cell doors and uncovered the secrets of life inside the UK's toughest prison,” Reed says in his documentary.

“Many of HMP Wakefield's inmates are imprisoned for life, some will never be released and will die as retirees behind bars. So should we treat the worst of the worst in a more humane way in prison? Or does society prefer to lock them up, take away the key and forget about them?” , he questions.

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