Nearly nine out of 10 (86%) licensed British gambling websites appear to be flouting the general data protection regulation (GDPR), the strict rules governing how organisations can collect, store and process personal data, according to the research.

Criteo, whose main establishment is in France, operates by displaying targeted advertising on websites managed by third parties. To do this, it collects and processes browsing data using connection trackers - cookies - from individuals located in France and other EU member states who visit partner websites.