Duty Free is about two British couples, David and Amy Pearce and Robert and Linda Cochran, who meet while holidaying at the same Spanish hotel in Marbella and the interruptive affair conducted by David Pearce and Linda Cochran during their break. Another recurring character is the hotel waiter Carlos.

Duty Free 'Casino' - David feels lucky, and despite their spending money running low, decides to visit the Casino. Concentration coolness and a strong nerve are called for as he pursues a sequence of winning numbers, but will he risk all on the flip of a coin?