Needed for the site to work and stay secure: security checks against bots, form protection, sign-in for schools and admins, and remembering your cookie choice. These do not track you and cannot be switched off.

Lets us measure visits and see which pages are useful, using Google Analytics. Google may process this data outside your country.

Remembers details you have entered, such as your email address on the school sign-in form, so you don't have to type them again.

Shows school videos from YouTube and Vimeo directly on the page. These services may set their own cookies and record that you watched. When off, you can still load a single video with one click.