A senior Customs officer tipped off a pirated-goods manufacturer that authorities had knowledge of his illegal activities during a dinner attended by other top officials, a court heard yesterday. Businessman Peter Siu Sik-sum, 47, told the District Court he knew several superintendents from the department, including Gregory Wong Pui-sham, 49, and sometimes met them socially. Wong has denied accepting and soliciting a $50,000 loan from Siu, a general manager of Golden Science Technology, on March 20 last year without the permission of the Chief Executive. The defendant, head of the department's prosecution, intelligence and investigation bureau, has also pleaded not guilty to trying to pervert the course of justice. The prosecution had said Wong, who has been suspended from the department pending the outcome of the trial, tried to delay payment of the loan after disclosing information to Siu on April 24 last year. Siu testified yesterday that on the day in question, Wong had told him he had received a letter from a colleague stating that Siu's company was involved in the production of pirated video compact discs. '[Wong] said from now on, when we are talking to each other, we should be more careful,' Siu said. He said Wong also told him that the letter had been sent to the Independent Commission Against Corruption as well as the police, the court heard. Siu added that Wong told him after the dinner that he would repay the $50,000 loan later. When questioned by defence barrister Graham Harris, Siu admitted that two other superintendents from the department were at the dinner. Siu had not told either his friends from the department or the police force about his illicit business, the court heard. Questioned by Mr Harris, he denied he had someone from the department or police force tip him off on possible raids. Siu, who has been granted immunity from prosecution, said the four factories operated by his company produced more than 15 per cent of the tens of millions of pirated VCDs made each month, most of them destined for the mainland. He said he had on two or three occasions suspended production at the companies because he was unsure if he wanted to remain in the business. The trial continues today before Judge Peter Line.