What are cookies
A cookie is a file containing an identifier (a combination of letters and numbers) that is passed between a web server and web browser and is stored by the browser. This identifier is then sent back to the server each time the browser requests a page from the server.
Cookies may be either "persistent" cookies or "session" cookies: a persistent cookie will be stored by a web browser and will remain valid until its set expiry date, unless deleted by the user before the expiry date; a session cookie, on the other hand, will expire at the end of the user session, when the web browser is closed.
Cookies do not typically contain any information that personally identifies a user, but personal information that we store about you may be linked to the information stored in and obtained from cookies.
Cookies can be used by web servers to identity and track users as they navigate different pages on a website and identify users returning to a website.
How to block cookies
Most browsers allow you to refuse to accept cookies; for example:
- in Internet Explorer (version 10) you can block cookies using the cookie handling override settings available by clicking "Tools", "Internet Options", "Privacy" and then "Advanced";
- in Firefox (version 24) you can block all cookies by clicking "Tools", "Options", "Privacy", selecting "Use custom settings for history" from the drop-down menu, and unticking "Accept cookies from sites"; and
- in Chrome (version 29), you can block all cookies by accessing the "Customise and control" menu, and clicking "Settings", "Show advanced settings" and "Content settings", and then selecting "Block sites from setting any data" under the "Cookies" heading.
- in Internet Explorer (version 10), you must manually delete cookie files (you can find instructions for doing so at http://support.microsoft.com/kb/278835);
- in Firefox (version 24), you can delete cookies by clicking "Tools", "Options" and "Privacy", then selecting "Use custom settings for history", clicking "Show Cookies", and then clicking "Remove All Cookies"; and
- in Chrome (version 29), you can delete all cookies by accessing the "Customise and control" menu, and clicking "Settings", "Show advanced settings" and "Clear browsing data", and then selecting "Delete cookies and other site and plug-in data" before clicking "Clear browsing data".
Blocking all cookies will have a negative impact upon the usability of many websites as they are used for storing information used on certain websites, for example storing your personal preferences or personalising your experience.
If you block cookies at present you will still be able to use all the features on our website.
How to delete cookies
You can delete cookies already stored on your computer; for example:
If you would like to contact us about any of the material that appears on our site please contact us at firstname.lastname@example.org.