A teenager who converted to Islam is accused of stabbing her Muslim boyfriend to death after the pair argued about her wearing tight clothing and short dresses, a UK court has heard.

Sarah Willis, 19, who works at a law firm, allegedly stabbed 29-year-old engineer Bilal Saddique with a kitchen knife in the leg, severing an artery, and he died an hour later.

Willis told police her boyfriend, a strict Muslim, was a "controlling man" who had wanted her to comply with Islamic standards of dress and hated her wearing "tight and short clothing" because "other men looked at her", reports This is Lancashire .

During their fatal argument last year, Preston Crown Court heard, Saddique had pulled Willis by the hair and taunted her with claims he had slept with another woman during their stormy three-year relationship.

When Willis started collecting her possessions, including a set of knives, to leave the home they shared in Lancashire, Saddique goaded her to hit or stab him, jurors heard.

Willis said she accidentally stabbed her boyfriend during a struggle as he grabbed her hand.

She then phoned emergency services and tried to stem the bleeding with a towel but attempts to revive Saddique were unsuccessful.

Prosecutors said the stabbing occurred "in the heat of the moment" and that Willis intended to cause serious harm, given that the knife was driven deep into Saddique's thigh.