PostOffice.co.uk was catalogued by the UXP2 Lab over the styling of its form controls. According to the entry, the site designs its check boxes to appear as radio buttons, so that the user is more inclined to select only one option.
‹ All examples PostOffice.co.uk
Postoffice.co.uk: Check Boxes Look Like Radio Buttons.
“The site designs the check boxes to appear as radio buttons so the user is more inclined to select only one.”