Below is a screenshot from Seetickets.com (taken March 2013). The tickets purchased in this example total £83.81. However, there’s a pre-checked “cancellation protection” fee for £3.00 that is not shown in the price anywhere on the page.
Hitting “Buy tickets” then debited the credit card for £86.81, shown below on the confirmation page:
Unwary users are automatically be charged for cancellation protection which is sneakily added into the basket.