Instead, he claimed the charge he should face for killing Mr Boorman was manslaughter on the grounds of diminished responsibility.

On Tuesday, a jury unanimously convicted him of murder after a day of deliberations.

During the trial, the court heard that Arslan was not mentally ill or in the grip of psychosis, but that he has been diagnosed with a personality disorder.

It manifested itself in extreme anger and aggression to perceived insults, making grandiose claims about himself and an exaggerated sense of his own importance.

The prosecution said that, despite having a personality that lay outside of what is normal, Arslan was fully in control of himself and knew the difference between right and wrong.

The defence argued that Arslan’s personality disorder is in itself an abnormality of mental function and therefore provided a defence to murder.

Trial judge Mrs Justice Cutts said she wanted a further psychiatric report prepared on Arslan before she would sentence him.

‘Small rows escalated’

She told him: “I am not going to sentence you today; I am going to sentence you on June 9 when I will have an additional report on you.

“In the meantime you will remain in Broadmoor.”

At the time of the killing, Arslan was the subject of an injunction prohibiting him from threatening or abusing his neighbours, and had been served with a notice of eviction.

Small rows over parking and a scratch to a car had escalated to the point where Arslan had repeatedly threatened to attack or kill those living near him.

In May, Mrs Boorman had made a statement to police setting out a summary of the threats they had received from the defendant.

She said they were worried about being murdered, or that someone was going to be seriously hurt very soon.

Arslan made counter-allegations, accusing the Boormans of racially abusing him.

The day before the attack, a police officer had telephoned Arslan about the complaint he had made.

During the call, Arslan verbally abused the officer, calling him a motherf***** and a c***sucker, and told him he would sort his neighbour out himself, adding “I will murder him”.