HMS Illustrious has left Portsmouth as she heads to Gibraltar for a routine visit after increased tensions with Spain over border checks.
The ships will be taking part in what defence officials have said is a long-scheduled deployment codenamed Cougar '13 in the Mediterranean and the Gulf.
The vessels set sail from Portsmouth as a diplomatic spat continued between the UK and Spain, triggered by the creation of an artificial reef by the Gibraltarian authorities which the Spanish claim will destroy fishing in the area.
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