A teenager who stabbed his close friend in the back as violence flared at a house has been jailed.

Jonathan Winstanley, 18, plunged the blade of a foot-long knife into Michael Hill as trouble flared at the teen's parents' home in Firth View Walk, Workington, on March 24.

Mr Hill suffered a single 5cm deep wound which led to him suffering a collapsed lung and needing hospital treatment.

However, Carlisle Crown Court heard how Mr Hill had been aggressive after arriving at the address.

He had swung a punch at the step-father of Winstanley, whose mother was pushed across a room as fighting broke out between the two pals.

Winstanley was said to have then taken a knife from the kitchen to protect his family, ward off Mr Hill and get him out of the property.

But the remorseful teen accepted his actions then went beyond self defence when he stabbed his friend.

Winstanley, also of Firth View Walk, admitted a charge of unlawful wounding.

He was sentenced to 20 months in jail by Recorder John Corless, who said: "It is by luck and good fortune that no more serious injury was caused."