“A vicious and ferocious attack.”

Justice Neil Garnham

Sentencing him to a hospital order under the Mental Health Act, Mr Justice Neil Garnham said: “You killed him in the course of a vicious and ferocious attack.

“The evidence suggests you are riven with remorse for what you have done.

“I have no doubt that you were at the time of the attack, and that you remain, highly dangerous.

“Without medication, there’s a real risk of a similar event in the future.”

Garnham told the court he believed the teen could pose a “significant risk of serious harm to the public”.

For the prosecution, Kerry Maylin, told the court: “This was a sustained and prolonged attack.

“He said voices in his head had been telling him to kill.

“The night before the incident the voice was telling him to kill someone and that morning, it was Barry.”

Ms Maylin explained that the boy left a note at the house and made a video apologising for his actions.

Later on, he confessed to cops he started the assault by hitting Mr Hounsome with a hammer, before stabbing him with knives, spraying him with ammonia and drilling into his head while he was still alive.

Mr Hounsome – who was living with his Russian wife Natalia, a senior lecturer in global health economics – tried to escape but the boy “pulled him back and forced him to the floor”.

He had a number of defensive wounds and his front door key was found underneath his body, the court also heard.

Maylin explained that the teen had begun to hear voices in his head around 18 months before and never told anyone about the issue.

The voices were male with an Eastern European accent, and became “more manic, aggressive and demanding.”

They became increasingly sinister, moving from telling him to kill animals to carrying out attacks on random people, the court heard.

Maylin told the court the boy said: “Something in my head kept telling me to do it. I didn’t want to do it.

“I tried to push myself away but I ended up doing it. I’m so sorry.”

The killer has now has been diagnosed with paranoid schizophrenia and is thought to have experienced a psychotic episode just before the attack, the court heard.

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