David Cameron chaired a Cabinet meeting in Bristol and faced questions at one of his Cameron Direct meetings.

BBC: UK Politics

The sub has so many lights and cameras that it is like an underwater TV studio - with Mr Cameron able to direct and film the action from within.

BBC: James Cameron back on surface after deepest ocean dive

Labour have also raised the prospect of some form of referendum in the future but, like Mr Cameron, the party's leadership oppose a direct vote on whether to stay or exit.

BBC: MPs debate case for UK pulling out of European Union

Labour backbencher David Winnick urged Mr Cameron to guarantee that no military action would be taken against Libya without "direct authorisation" from the United Nations Security Council.

BBC: PMQs: Government accused of incompetence over Libya