What are cookies?

Cookies are short computer programs written in human-readable text. They are placed on your device when you visit a site and are used to identify your device for the purposes described here.

We use Operational cookies. These are essential to deliver the site, or features of it that you select, in a convenient way. Examples: remember who you are, your preferences and your settings, so you don’t need to enter them each time you change page; display content on your device properly; fraud prevention (e.g. to make sure the same person doesn’t complete the same survey twice). Because these features are necessary, this tool does not allow you to opt out. Nevertheless, if you wish you can set your browser to reject all cookies, in which case the site may not display properly, and the features you select may not be available.