A British couple who claimed to be tourists coming from Thailand have been arrested at a Spanish airport with more than 33 kilograms of cannabis in their suitcases.

The pair were remanded in custody after suspicious officers picked them out from other passengers arriving at Valencia Airport because of their 'nervous and evasive attitude.'

They had arrived on a flight from France and were carrying two large pieces of luggage and said they had nothing to declare.

But when the bags were checked with X-ray scanners, security staff discovered that they were carrying no clothing or personal belongings.

The bags were instead packed with vacuum-sealed bags of a plant-based substance, which was taken to be tested and discovered to be cannabis.