An alleged cannibal killer claims he is "capable of anything" in a chilling interview from prison, where he is serving life for the murders of four people.

Britain's longest-serving prisoner, Robert Maudsley, opened up to psychiatrist Dr Bob Johnson about his appetite for bloodlust speaking from HMP Wakefield.

The 66-year-old killer who was almost called to defend Charles Bronson has been serving time since murdering builder John Farrell in 1974 after he had picked him up as a rent boy.

In the new documentary The Killer In My Family, Maudsley tells his psychiatrist in a chilling interview: "I'm capable of doing anything, Bob.

"And that's why I've got to be cautious Bob, you know."

'Cannibal' killer Robert Maudsley
'Cannibal' killer Robert Maudsley

Maudsley murdered Farrell after flying into a rage when he showed him photos of a young girl he had abused, slowly garrotting him at his north London flat.

He handed himself into police and was sent to Broadmoor, where he carried out his second murder in 1977.

Along with a fellow psychopath, they took an inmate hostage in his cell and tortured him to death for nine hours.

Maudsley was jailed in 1974 for murdering builder John Farrell
Maudsley was jailed in 1974 for murdering builder John Farrell

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The man was discovered with his head "cracked open like a boiled egg" with a spoon hanging out.

A guard claimed Maudsley had eaten part of the victim's brain, earning him the "cannibal" nickname.

The information turned out to be false, but he was convicted of manslaughter and sent to Wakefield prison.

In a documentary, he claims to a prison psychiatrist he is 'capable of anything'
In a documentary, he claims to a prison psychiatrist he is 'capable of anything'
Robert Maudsley letters
A nephew still exchanges letters with him

Here, he went on another gruesome rampage in 1978, slaughtering two fellow prisoners in one day.

He butchered Salney Darwood, 46, after luring him to his cell before strangling and stabbing him with a shank made from a sharpened soup spoon.

Later, he crept into William Roberts' cell, smashing his head against a wall before using his homemade knife to prise open his skull.

Walking into the wing office, he calmly told prison guards: "There'll be two short on the roll call."

Maudsley as a schoolboy in Toxteth, Liverpool
Maudsley as a schoolboy in Toxteth, Liverpool

Since 1983, Maudsley spends 23 hours a day in "the cage", a bulletproof glass cell built specifically for him.

His nephew Gavin, who still regularly visits him in jail and exchanges letters with him, told the program he has a genius-level IQ and enjoys fine art, poetry and classical music, as well as nature documentaries.

Following the death of Moors Murderer Ian Brady in May 2017, Maudsley is Britain's longest-serving inmate.

Britain currently has 60 "lifers" who will die behind bars including "Yorkshire Ripper" Peter Sutcliff and Steve Wright the "Suffolk Strangler".