A little bird tells me that London Zoo is desperately hoping that no more of its buildings will be listed - 'no more monuments', pleaded one source last week. The elephant house doesn't suit its inhabitants because the interior is much too large at the expense of exterior space, so its listing was not universally appreciated. And the old men at the zoo are hoping to introduce more aviaries, lower than the listed Snowdon one so they can access the inhabitants to feed and monitor them more readily. One success for the future, however, is Wharmby Kozdon's new Conservation Centre, which is halfway up and features five distinctive flues - a cross between Samurais (it's being built by Kajima) and honeypots - poking from a roof made from timber from sustainable forests. Mayoral hopeful Ken Livingstone was on hand to give the new building a push last week, posing for photographers with a snake round his neck. 'Remind you of Jeffrey Archer, does it, Ken?' asked one paparazzo. Both Ken and the snake were unmoved.