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Motorists queue on August 13, 2013 at the border crossing between Spain and Gibraltar in La Linea de la Concepcion. Irate drivers waited up to five hours to enter Gibraltar today, some even pushing their cars to save fuel, as Spain enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. The latest flare-up was sparked when Gibraltar sank concrete blocks in disputed waters to create an artificial reef, making it impossible for Spanish fishing fleets to operate in the area. MARCOS MORENO/AFP/Getty Images ( 522067299 )

Passengers prepare to board a flight at Gibraltar International Airport on August 8, 2013 in Gibraltar. David Cameron has spoken with his Spanish counterpart, Mariano Rajoy, and Mr Rajoy has offered to 'reduce measures' at the Gibraltar border. Tensions between the British and Spanish governments have been raised on issues surrounding the sovereignty of Gibraltar. An increase in Spanish border crossing checks between the Rock and mainland Spain, leading to lengthy queues, is widely considered to be a retaliatory move for the construction of an artificial reef in British waters, which it is claimed has had a negative impact on Spanish fishing vessels in the area. (Photo by Oli Scarff/Getty Images) ( 175782734 )

Motorists queue on August 13, 2013 at the border crossing between Spain and Gibraltar in La Linea de la Concepcion. Irate drivers waited up to five hours to enter Gibraltar today, some even pushing their cars to save fuel, as Spain enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. The latest flare-up was sparked when Gibraltar sank concrete blocks in disputed waters to create an artificial reef, making it impossible for Spanish fishing fleets to operate in the area. MARCOS MORENO/AFP/Getty Images ( 522067382 )

Motorists queue on August 13, 2013 at the border crossing between Spain and Gibraltar in La Linea de la Concepcion. Irate drivers waited up to five hours to enter Gibraltar today, some even pushing their cars to save fuel, as Spain enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. The latest flare-up was sparked when Gibraltar sank concrete blocks in disputed waters to create an artificial reef, making it impossible for Spanish fishing fleets to operate in the area. MARCOS MORENO/AFP/Getty Images ( 522067362 )

Motorists queue on August 13, 2013 at the border crossing between Spain and Gibraltar in La Linea de la Concepcion. Irate drivers waited up to five hours to enter Gibraltar today, some even pushing their cars to save fuel, as Spain enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. The latest flare-up was sparked when Gibraltar sank concrete blocks in disputed waters to create an artificial reef, making it impossible for Spanish fishing fleets to operate in the area. MARCOS MORENO/AFP/Getty Images ( 522067375 )

Motorists queue as pedestrians walk on August 13, 2013 at the border crossing between Spain and Gibraltar in La Linea de la Concepcion. Irate drivers waited up to five hours to enter Gibraltar today, some even pushing their cars to save fuel, as Spain enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. The latest flare-up was sparked when Gibraltar sank concrete blocks in disputed waters to create an artificial reef, making it impossible for Spanish fishing fleets to operate in the area. MARCOS MORENO/AFP/Getty Images ( 522067534 )

Passengers smoke and use their mobile phones as they queue on August 13, 2013 at the border crossing between Spain and Gibraltar in La Linea de la Concepcion. Irate drivers waited up to five hours to enter Gibraltar today, some even pushing their cars to save fuel, as Spain enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. The latest flare-up was sparked when Gibraltar sank concrete blocks in disputed waters to create an artificial reef, making it impossible for Spanish fishing fleets to operate in the area. MARCOS MORENO/AFP/Getty Images ( 522067948 )

Two women replace plastic blocks as they queue on August 13, 2013 at the border crossing between Spain and Gibraltar in La Linea de la Concepcion. Irate drivers waited up to five hours to enter Gibraltar today, some even pushing their cars to save fuel, as Spain enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. The latest flare-up was sparked when Gibraltar sank concrete blocks in disputed waters to create an artificial reef, making it impossible for Spanish fishing fleets to operate in the area. MARCOS MORENO/AFP/Getty Images ( 522067466 )

People cross the Gibraltar airport tarmac after the border crossing between Spain and Gibraltar on August 13, 2013. Irate drivers waited up to five hours to enter Gibraltar today, some even pushing their cars to save fuel, as Spain enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. The latest flare-up was sparked when Gibraltar sank concrete blocks in disputed waters to create an artificial reef, making it impossible for Spanish fishing fleets to operate in the area. MARCOS MORENO/AFP/Getty Images ( 522068022 )

The peninsular of Gibraltar on August 8, 2013 in Gibraltar. David Cameron has spoken with his Spanish counterpart, Mariano Rajoy, and Mr Rajoy has offered to 'reduce measures' at the Gibraltar border. Tensions between the British and Spanish governments have been raised on issues surrounding the sovereignty of Gibraltar. An increase in Spanish border crossing checks between the Rock and mainland Spain, leading to lengthy queues, is widely considered to be a retaliatory move for the construction of an artificial reef in British waters, which it is claimed has had a negative impact on Spanish fishing vessels in the area. (Photo by Oli Scarff/Getty Images) ( 175782878 )

A British policeman removes a spike strip at Gibraltar airport tarmac at the border crossing between Spain and Gibraltar on August 13, 2013. Irate drivers waited up to five hours to enter Gibraltar today, some even pushing their cars to save fuel, as Spain enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. The latest flare-up was sparked when Gibraltar sank concrete blocks in disputed waters to create an artificial reef, making it impossible for Spanish fishing fleets to operate in the area. MARCOS MORENO/AFP/Getty Images ( 522068101 )

Tourists ride a bus on Vistas de la Plaza del Reloj in Gibraltar on August 13, 2013. This rock of seven square kilometers enclosed in the coast of Andalusia, off the tip of southern Spain, is reminiscent of England: the red phone booths, mailboxes Royal Mail, the lampposts decorated with flowers, and double decker buses. MARCOS MORENO/AFP/Getty Images ( 522068836 )

Food advertising boards are displayed on Casemates square in Gibraltar on August 13, 2013. This rock of seven square kilometers enclosed in the coast of Andalusia, off the tip of southern Spain, is reminiscent of England: the red phone booths, mailboxes Royal Mail, the lampposts decorated with flowers, and double decker buses. MARCOS MORENO/AFP/Getty Images ( 522068870 )

Tourists ride a bus in Gibraltar on August 13, 2013. This rock of seven square kilometers enclosed in the coast of Andalusia, off the tip of southern Spain, is reminiscent of England: the red phone booths, mailboxes Royal Mail, the lampposts decorated with flowers, and double decker buses. MARCOS MORENO/AFP/Getty Images ( 522068920 )

A Royal Mail employee gathers the contents of a mailbox in Gibraltar on August 13, 2013. This rock of seven square kilometers enclosed in the coast of Andalusia, off the tip of southern Spain, is reminiscent of England: the red phone booths, mailboxes Royal Mail, the lampposts decorated with flowers, and double decker buses. MARCOS MORENO/AFP/Getty Images ( 522069003 )

Tourists wait for taxis near a phone booth in Gibraltar on August 13, 2013. This rock of seven square kilometers enclosed in the coast of Andalusia, off the tip of southern Spain, is reminiscent of England: the red phone booths, mailboxes Royal Mail, the lampposts decorated with flowers, and double decker buses. MARCOS MORENO/AFP/Getty Images ( 522069066 )

People mill around Casemates square in Gibraltar on August 13, 2013 as Spain today enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. On the "Rock" itself, defiant residents declared themselves thoroughly British, surrounded by English pubs serving fish and chips, Royal Mail letter boxes, bright red telephone cabins and the occasional monkey. MARCOS MORENO/AFP/Getty Images ( 522069325 )

Tourists look at store goods on Casemates square in Gibraltar on August 13, 2013 as Spain today enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. On the "Rock" itself, defiant residents declared themselves thoroughly British, surrounded by English pubs serving fish and chips, Royal Mail letter boxes, bright red telephone cabins and the occasional monkey. MARCOS MORENO/AFP/Getty Images ( 522069343 )

A man stands at a window above British flags in Gibraltar on August 13, 2013 as Spain enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. On the "Rock" itself, defiant residents declared themselves thoroughly British, surrounded by English pubs serving fish and chips, Royal Mail letter boxes, bright red telephone cabins and the occasional monkey. MARCOS MORENO/AFP/Getty Images ( 522069256 )

A woman leaves a typical house on main street in Gibraltar on August 13, 2013. This rock of seven square kilometers enclosed in the coast of Andalusia, off the tip of southern Spain, is reminiscent of England: the red phone booths, mailboxes Royal Mail, the lampposts decorated with flowers, and double decker buses. MARCOS MORENO/AFP/Getty Images ( 522069236 )

Tourist walk on Main street in Gibraltar on August 13, 2013 as Spain today enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. On the "Rock" itself, defiant residents declared themselves thoroughly British, surrounded by English pubs serving fish and chips, Royal Mail letter boxes, bright red telephone cabins and the occasional monkey. MARCOS MORENO/AFP/Getty Images ( 522069208 )

People sit at an Irish bar on Main street in Gibraltar on August 13, 2013 as Spain today enforced tight border checks in a growing row with Britain over the tiny territory and its surrounding waters. On the "Rock" itself, defiant residents declared themselves thoroughly British, surrounded by English pubs serving fish and chips, Royal Mail letter boxes, bright red telephone cabins and the occasional monkey. MARCOS MORENO/AFP/Getty Images ( 522069276 )

Spanish Prime Minister Mariano Rajoy speaks during a press conference after meeting with Spain's King Juan Carlos at the Marivent Palace in Palma de Mallorca on August 9, 2013. Spain will take "all necessary measures" to defend its interests in Gibraltar, Mariano Rajoy said today amid a row with London over the British outpost on Spain's southern tip. JAIME REINA/AFP/Getty Images ( 521968395 )

Passengers board a flight at Gibraltar International Airport on August 8, 2013 in Gibraltar. David Cameron has spoken with his Spanish counterpart, Mariano Rajoy, and Mr Rajoy has offered to 'reduce measures' at the Gibraltar border. Tensions between the British and Spanish governments have been raised on issues surrounding the sovereignty of Gibraltar. An increase in Spanish border crossing checks between the Rock and mainland Spain, leading to lengthy queues, is widely considered to be a retaliatory move for the construction of an artificial reef in British waters, which it is claimed has had a negative impact on Spanish fishing vessels in the area. (Photo by Oli Scarff/Getty Images) ( 175782885 )

Britain's helicopter carrier HMS Illustrious leaves Portsmouth navy base in southern England, on August 12, 2013. British warships began setting sail for the Mediterranean on Monday for a naval exercise that will see one vessel dock in Gibraltar, as tensions rise with Spain over the British-held territory. ANDREW COWIE/AFP/Getty Images ( 522041475 )

The helicopter carrier HMS Illustrious departs Portsmouth for a deployment to the Mediterranean on August 12, 2013 in Portsmouth, England. Three Royal Navy warships have set sail for the Mediterranean for a routine deployment amid increased tensions between Britain and Spain over the sovereignty of Gibraltar. The Ministry of Defense has described the warship's movements as "long-planned" and part of "a range of regular and routine deployments". (Photo by Oli Scarff/Getty Images) ( 176232104 )

Relatives of navy personnel wave as the helicopter carrier HMS Illustrious departs Portsmouth for a deployment to the Mediterranean on August 12, 2013 in Portsmouth, England. Three Royal Navy warships have set sail for the Mediterranean for a routine deployment amid increased tensions between Britain and Spain over the sovereignty of Gibraltar. The Ministry of Defense has described the warship's movements as "long-planned" and part of "a range of regular and routine deployments". (Photo by Oli Scarff/Getty Images) ( 176232105 )