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What is Spain v Gibraltar row about?

5 August 2013 Last updated at 23:13 BST

The Prime Minister says he has 'serious concerns' over Spanish proposals to charge a fee for crossing the border into Gibraltar.

Spain has said it is considering a range of proposals including a new 50 euro (£43) fee to cross the border into the British territory.

The chief minister of Gibraltar has accused Spain of sabre-rattling and "acting like North Korea" in the continuing dispute over fishing rights.

Tom Burridge reports.