Colonel Gaddafi's regime is clinging onto power in Libya as much of the country falls into anti-government hands.
Reporting from Tripoli, Middle East editor Jeremy Bowen said that it did not "feel like a city which is about to experience regime change".
But while "instant collapse" of the regime did not seem likely, he said, pro-Gaddafi forces only retained power over a "shrunken rump state".
"I doubt they have the capacity to do anything longer range outside of Tripoli," he added. "Longer term I can't see how they can survive."
British Defence Secretary Liam Fox said that Col Gaddafi had become "a liability to his country and his people".
He refused to be drawn on the issue of imposing a no-fly zone over the country, and said the UK was focussing on international diplomacy.
"The whole point is to get him [Gaddafi] to go as quickly as possible," he said.
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