WHAT a difference a month makes. Time was when Sir David Akers-Jones was just another retired chief secretary, walking his dog in the spacious garden of his white-walled, two-storey New Territories villa (seen recently on BBC television), with a cosy sinecure that provided him with a handsome office if he felt like popping into town. And most people appeared to be able to live with that. But then came his resignation from the chairmanship of the Housing Authority, his appointment by Beijing as a Hongkong affairs adviser and the inevitable dark mumblings about betrayal. So yesterday, lunching at the Mandarin Grill, I saw Sir David walk through the restaurant to his table with most eyes fixed on him. Worse, the occupants at two tables surrounding him could scarcely contain their sniggers as Sir David studied the menu. Really, people. Can't we show some respect for an esteemed Hongkong adviser?