A cookie is a small file of letters and numbers that we store on your browser or the hard drive of your computer (if you consent to us using cookies). Cookies contain information that is transferred to your computer's hard drive.
We only use analytical cookies which enable us to recognise and count the number of visitors and to see how visitors move around our website. This helps us to improve the way our website works, for example, by ensuring that users are finding what they are looking for easily.
You can find more information about the individual cookies we may use and the purposes for which we use them in the table below:
|Cookie Name||Expiration Time||Description|
|_ga||2 years||Used to distinguish users.|
|_gid||24 hours||Used to distinguish users.|
|_gat||1 minute||Used to throttle request rate. If Google Analytics is deployed via Google Tag Manager, this cookie will be named _dc_gtm_.|
|AMP_TOKEN||30 seconds to 1 year||Contains a token that can be used to retrieve a Client ID from AMP Client ID service. Other possible values indicate opt-out, inflight request or an error retrieving a Client ID from AMP Client ID service.|
|_gac_||90 days||Contains campaign related information for the user. If you have linked your Google Analytics and AdWords accounts, AdWords website conversion tags will read this cookie unless you opt-out.|
|__utmt||10 minutes||Used to throttle request rate.|
|__utmc||End of browser session||Not used in ga.js. Set for interoperability with urchin.js. Historically, this cookie operated in conjunction with the __utmb cookie to determine whether the user was in a new session/visit.|
|__utmv||2 years from set/update||Used to store visitor-level custom variable data. This cookie is created when a developer uses the _setCustomVar method with a visitor level custom variable. This cookie was also used for the deprecated _setVar method. The cookie is updated every time data is sent to Google Analytics.|
|__utmx||18 months||Used to determine a user’s inclusion in an experiment.|
|__utmxx||18 months||Used to determine the expiry of experiments a user has been included in.|
|_gaexp||Depends on the length of the experiment but typically 90 days.||Used to determine a user’s inclusion in an experiment and the expiry of experiments a user has been included in.|
You can block cookies by activating the setting on your browser that allows you to refuse the setting of all or some cookies. However, if you use your browser settings to block all cookies (including essential cookies) you may not be able to access all or parts of our site.
Most web browsers allow some control of most cookies through the browser settings. To find out more about cookies, including how to see what cookies have been set and how to manage and delete them, visit www.allaboutcookies.org.
Except for essential cookies, all cookies will expire as listed in the above table.