A group of 6 of us have booked (through Thomas Cook) to go on holiday to Zante in the summer, however one member of the group dropped out and doesn't want to come anymore. They have only paid £50 towards the holiday which was a lowered deposit (full deposit was £75), so for them to drop out would there be an additional fee that they need to pay? Or do they just need to pay off the rest of the deposit?