ONE of the great advantages of being perched on the higher echelons of the Hongkong Civil Service is that occasionally there must come an opportunity to use the system to your own advantage. That is the poser put forward by a reader living at Jardine's Lookout whose apartment block is a stone's throw from the civil servant enclave of Mount Butler. ''Whilst most of us have to trek down the road to board green minibuses to take us into town, the residents of Mount Butler government quarters actually have the minibuses cruising within its premises picking up passengers,'' she complains. ''And while we have to get off at Causeway Bay and make our way to Central from there, the Mount Butler pick-up goes all the way to Admiralty, which is conveniently close to all the government offices. ''I don't want to appear cynical, but could it be that a gentle nudge was made in the right direction when the licence was issued for this particular route?'' Quite, quite. But I'm sure there is an innocent explanation for all this.