houses the BBC's corporate division, including Director-General Mark Thompson's office. The lengthy repair work also comes weeks after it was revealed that Land Securities had charged the BBC ?57 to change a lightbulb. It was part of a catalogue of costly jobs, including ?2,500 to put up nine shelves, ?1,000 to erect a sign and ?5,500 to install a ?2,000 air-conditioning unit. The figures emerged after an exasperated BBC worker posted a memo on an internal message board.