The new Dutch consumer authority ACM plans to get tough on travel companies which publish misleading prices in their adverts, RTL news reports on Monday.

The broadcaster says travel firms can face a fine of up to €450,000 if they fail to ensure holiday prices are all-inclusive and that holidaymakers don’t face extra fees when they book.

‘Last year our research showed 80% of travel firms do not adhere to legislation on price transparency,’ spokeswoman Anita Vegter told RTL. ‘Despite efforts by the sector association and advertising standards body, there has been no change in behaviour.’

In particular, consumers are being warned that so-called special deals may not be the cheapest offers and to be aware of extra charges, such as the cost of taking baggage, when booking flights.