A vulnerable man was slashed on the cheek and told he would have his toe cut off by a violent blackmailer who was trying to extort cash, a court heard.

Leon Henry, 28, visited the home on George Pope Road, Norwich, where the victim was staying and attacked and threatened him in a bid to get £400, Norwich Crown Court heard.

John Farmer, prosecuting, said Henry then returned with another man on November 18 last year and again tried to get the 49-year-old victim to hand over cash from his benefit money and the man with Henry then stabbed the victim in the foot.

The victim's friend was also robbed of £200.

Mr Farmer described Henry's behaviour as a 'campaign of criminal conduct' against a vulnerable man.

Henry of Geoffrey Watling Way, Norwich, was convicted by the jury after two-and-half-hours of two charges of blackmail, two charges of unlawful wounding, robbery and assault by beating.

He was found not guilty of one charge of causing actual bodily harm. Henry had denied all the offences.

The court heard Henry had a number of previous convictions.

Recorder Frank Burton adjourned sentence until Friday August 25 and asked for reports to see what danger Henry posed.

He told him: 'I regard your case as a serious one.'

He said that Henry inevitably faced a jail sentence and remanded him in custody.

During the trial the victim, who gave evidence from behind a screen, described how Henry had dragged a blade across his face with enough force to draw blood and got him to take off his sock and threatened to cut off his toe.

He said he eventually went to police after the last incident as he realised he would keep coming back asking for cash.

He said 'I was frightened. There was no end to it. He was going to keep demanding money and I could not let it continue.'

He added: 'I was just hoping he would leave us alone.'