A BUSINESSMAN and his lover kidnapped his former girlfriend after pouncing on her in a lift and knocking her out with chloroform, the High Court heard yesterday. The terrifying attack happened a year after Lau Kin-hung sent two heavies round to the flat of former girlfriend Chow Sau-ling to demand $300,000, it was alleged. Ms Chow, 24, said Lau, 36, and his new lover Wu Pui-kwan, 44, leaped on her as she left her Yuen Long flat for work on February 22 last year. She said Wu, whom she had never seen before, entered the lift and stood behind her. Wu then grabbed her round the neck and tried to force a white cloth into her mouth. As they struggled Lau got in the lift and punched her several times, the jury heard. Ms Chow, an airline worker, said she could smell alcohol as the pair again tried to stuff the towel into her mouth. She fainted. Prosecutor Anna Lai said caretaker Cheng Wah discovered Wu and Lau trying to carry their unconscious victim down a back staircase after he heard someone screaming. Wu and Lau allegedly told Mr Cheng they were taking Ms Chow to the doctor and left her on the floor saying they were going to get a taxi. But seconds later Ms Chow came round and told him what had happened, Mr Justice Chan heard. Mr Cheng chased after the couple and caught Wu. Lau, a former garment business boss, was arrested at his Kowloon home. Ms Lai said police discovered two bottles of chloroform, a white towel, adhesive tape and syringes in Wu's bag. Ms Chow said that in November 1993, after she had left Lau, two strangers called at her flat and demanded $300,000. 'I telephoned Lau. He said the $300,000 was money he gave me during the time we cohabited,' she said. She said Lau had paid her $20,000 a month during the relationship. Lau and Wu deny kidnapping Ms Chow and administering chloroform with intent to kidnap.