There is a LibDem establishment campaign to prevent Lembit Öpik becoming their candidate for London Mayor. This is a mistake. The LibDems are likely to be annihilated in the Mayoral race if they put forward a nonentity candidate.
With Lembit they will get media coverage in what will be a battle of strong personalities, without him they will be ignored. Like Boris and Ken, Lembit has single-name recognition, he is media friendly and will hold his own in hustings. If the LibDems choose anyone else they will be shooting themselves in the foot.