More than 13,000 litres of counterfeit alcohol have been seized at Cairnryan near Stranraer.
Customs officers searched a 40 foot trailer after it arrived on a ferry from Belfast.
They found 26 pallets of illicit vodka along with a number of counterfeit vodka bottle labels.
The potential lost revenue from duty and taxes is estimated at more than £260,000.
The A77 is closed in both direction at Cairnryan in Dumfries and Galloway, due to flooding.
A man and woman have appeared at Stranraer Sheriff Court following the death of 65-year-old man on Christmas Day.
Christina Biggar, 55, from Cairnryan, is charged with murdering George Potts at an address in Cairnryan. She is also charged with attempting to pervert the course of justice.
James Potts, 62, from Ballantrae in Ayrshire, is charged with attempting to pervert the course of justice. He made no plea or declaration to the petition and the pair were remanded in custody until January 4 next year.
Dumfries and Galloway Police are still investigationing the incident.
Police officers tasked with preventing illegal immigrants entering the UK through the port of Cairnryan, in Dumfries and Galloway have met with MPs to discuss concerns that they are being overstretched.
Since the UK Border Agency removed its staff from the Ferry Terminal in 2010, the number of illegal immigrants trying to enter mainland Britain through the port has risen 136 percent.
The Scotland Office Minister David Mundell has visited Northern Ireland to see first-hand how the UK Border Agency (UKBA) monitors the Common Travel Area. He'll return to Cairnryan by ferry to meet Dumfries & Galloway Police and other stakeholders to discuss the policing of the Galloway ports.
The tour will include a meeting with the Police Service of Northern Ireland and the Minister of Justice for the Northern Ireland Executive, as well as tours of Belfast City immigration control and a briefing from the team responsible for the oversight of Common Travel Area operations.
In Cairnryan, the Minister will meet interested stakeholders, local politicians and representatives of Dumfries & Galloway Police for a discussion on a recent UKBA report which reviewed working practices in place to help prevent illegal immigration through the port.
Speaking ahead of the visit, David Mundell said:
“The security of our borders is of paramount importance to all of us and I shall be looking closely at the way the arrangements are working on both the Northern Ireland and Scottish sides.
“Over the past 18 months UKBA and Dumfries and Galloway Constabulary have worked collaboratively on the policing of Stranraer Ports. Their combined efforts have ensured that a greater number of illegal immigrants have been intercepted in their attempts to travel onto mainland UK.
“The key to resolving this issue is working with the Irish Republic to ensure that it is not as attractive for people to come into their country and through the Common Travel Area into the UK.
"Understandably, the Northern Ireland Executive want to ensure freedom of travel within Ireland as envisaged by the Good Friday Agreement and don’t want the crossings to another part of the UK turned into an international border.
"We have to recognise and work with these sensitivities and that why I am going to Belfast ahead of my visit to Cairnryan."
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