The EU has published consumer protection directives. Members states have 2 years to implement and enforce these directives.
The interesting bit is this:
3) Banning pre-ticked boxes on websites
When shopping online – for instance buying a plane ticket – you may be offered additional options during the purchase process, such as travel insurance or car rental. These additional services may be offered through so-called ‘pre-ticked’ boxes. Consumers are currently often forced to untick those boxes if they do not want these extra services. With the new Directive, pre-ticked boxes will be banned across the European Union.