C hing,not for argue, just for friendly discussion, the principal of JD is changeling the government decision is whether reasonable or ultra virus. Although they have state very clear, but if it unreasonable, the court can still judge it is invalid. U remember Mr Chan has win a case against the IR. Of course, whether u have enough resource to play with IR is another issue. Government action need to be fair and reasonable in theory no matter this action is justified by another statue or not. A not very good example, for the Philippine maid cases, the law already say Philippine maid will not have the right of abode in HK, then why still need to bring the case to the court?? It is because the claimant claim the law is against the basic law. In short, Government act can be challenged if you think they are unreasonable and act outside the power inferred.
C hing, thank you for your reply. In truth, u are right, being a normal people, really don;t have resource to play with IR or government, Better to follow their instruction. If not, IR may find another way to play with u! then PK la