GIBRALTAR - AUGUST 19: Royal Navy HMS Westminster arrives in Gibraltar with La Linea de la Concepcion, Spain in the background on August 19, 2013 in Gibraltar, Gibraltar. Spanish fishermen held a boat protest yesterday at the place where Gibraltar government dumped concrete blocks in the water to build an artificial reef which they claim will have a negative impact on their economy. British Prime Minister David Cameron has urged the European Commission to monitor the Gibraltar/Spain border as the increase in checks by the Spanish authorities contravenes the EU right of free movement and are leading to lengthy crossing queues. The Spanish Government says these checks are to tackle smuggling and are within their legal rights. British Royal Navy warships are arriving at Gibraltar, amid diplomatic tensions with Spain, as they head for their planned Mediterranean military exercises.  (Photo by Pablo Blazquez Dominguez/Getty Images)