The Prime Minister has warned the world is in a "new era" of global insecurity and uncertainty as he visited the UK's flagship aircraft carrier.The vessel, which set off from Portsmouth on Tuesday, will travel to the Mediterranean, Middle East, south-east Asia, Japan and Australia on an eight-month voyage, accompanied by escort ships from international allies.

The Prime Minister has warned the world is in a "new era" of global insecurity and uncertainty as he visited the UK's flagship aircraft carrier.The vessel, which set off from Portsmouth on Tuesday, will travel to the Mediterranean, Middle East, south-east Asia, Japan and Australia on an eight-month voyage, accompanied by escort ships from international allies.