A party gatecrasher struck a guest on the head with a bottle and then bit his finger in a second attack.

David Hyett upset a female partygoer by branding her "a slag" and was advised to leave by the victim, Terence Rzezniczak.

Witnesses watched in horror as 20-year-old Hyett used the bottle "with a lot of force" before being thrown out.

But he got back into the house in Mickleton Close, Oakenshaw, and bit Mr Rzezniczak on his left index finger, said Scott Coughtrie, prosecuting at Worcester Crown Court.

The day after the violence, Hyett stood in the driveway of the house where the party had been held and warned owner Adam Tricklebank he would send his mates round if he was charged with any offences.

Hyett, of Brinklow Close, Mathborough, was given 21 months detention. He pleaded guilty to assault causing actual bodily harm and witness intimidation.

Deputy judge Peter Stretton said Hyett's record of 47 previous offences was "appalling" for someone of his age.

He added: "You are perfectly prepared to use insults and violence on a whim. You have received considerable leniency in past sentences."

The violence erupted on August 6 last year after Mr Tricklebank threw a house-warming party for friends. He had also asked Hyett to leave before the victim added his voice and was bottled.

In 2001, marquee erector Hyett was given 12 months detention for punching and kicking a youth he had accused of being an arsonist. He had also been involved in a restaurant fracas where staff had been assaulted and chairs thrown, said Mr Coughtrie.

Defence counsel Dele Alakija said: "He gatecrashed the party and got into an argument with a young lady. When he was taken hold of, he struck out with the bottle."

Mr Alakija said Hyett suffered from hyperactivity as a child which caused big family problems. He began offending under the influence of bad company but resolved to move away from the area on his release.