A little-known clause in package holiday terms and conditions could see the cost of a package holiday rise by hundreds of pounds - even if you've already booked and paid. An article by Which? highlighted the little-known clause which can be found under Package Travel Regulations. It states that UK holiday firms can add a charge of up to 8% to a package holiday cost, without needing to offer the option of a free cancellation, in three circumstances. These circumstances include: a destination