Prime Minister David Cameron's spokesman has confirmed Britain is "seriously considering" taking legal action against Spain over extra checks at the border with Gibraltar.
The spokesman said the tighter checks by Spanish officials, which are causing long delays, are "politically motivated and totally disproportionate".
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Kurt Cochran and his wife Melissa had been visiting London from the US to celebrate their 25th wedding anniversary and were due to fly home.
The Government has previously described the new coin - which enters circulation tomorrow - as "harder to counterfeit than ever before".