Booking.com still duping customers, says watchdog

The sites had previously been found to be engaging in practices which included misleading discount claims, pressure-selling and hidden charges.

"We found clear evidence that Booking.com has not yet sufficiently cleaned up its act and is flouting the rules on pressure-selling, which could lead to millions of consumers being rushed into making a booking," she said.

A hotelier in Cornwall told BBC News: "I have a small B&B, which I have owned for three years, and have not yet made a profit, due to Booking.com.