A JAIL sentence for rape, robbery and attempted robbery was doubled by the Court of Appeal yesterday. The court increased the sentence on Chan Ming-man to eight years after ruling that the trial judge had been wrong to pass a concurrent term for the offences. Each offence was distinct, the court heard. The trial judge's decision to pass a lenient sentence because of Chan's previous good character was contrary to guidelines which stated that a clean record counted little in crimes of robbery and rape. Chan, 22, a former customs officer, had appeared before Mr Justice Jerome Chan. The court was told the first victim was grabbed from behind and threatened with a knife by Chan in a Tuen Mun car park. She gave him a total of $5,700, although he gave half back. He later forced his way into her flat and raped her. The next day, Chan and another man waylaid a couple in the same car park but the victims were allowed to leave and no valuables were taken. Deputy Crown Prosecutor Grenville Cross QC asked the court to review the sentence, which he said was manifestly inadequate and wrong in principle. He said that four years in jail for a single rape was lenient but could not be challenged under the existing guidelines. When coupled with the robbery, for which a concurrent term of three years was imposed, the sentence would be wrong because it meant Chan was given just one extra year for the rape. Christopher Grounds, for Chan, argued that a judge should not be rigidly bound by sentencing guidelines and should be able to look at the circumstances of the case and the mitigating factors.