Cookies

Our website uses cookies to give you the best user experience. Find out what cookies we use if you visit our website.

What is a cookie?

A cookie is a small piece of information created by a website and then stored on your computer. This information can be removed from your computer by yourself (persistent cookie) or it will be automatically deleted at the end of a browser session (session cookie). If the cookie still exists, the next time you go to the same website, it can access that cookie and the data inside it.

Managing cookies

All recent versions of popular browsers give users a level of control over cookies. For more information about controlling cookies in individual browsers, see the ICO website. Please note that disabling session cookies will result in the loss of some useful functionality of this website.

Cookie Name Default Expiration Time Description
__utma 2 years from set/update Used to distinguish users and sessions. The cookie is created when the javascript library executes and no existing __utma cookies exists. The cookie is updated every time data is sent to Google Analytics.
__utmt 10 minutes Used to throttle request rate.
__utmb 30 mins from set/update Used to determine new sessions/visits. The cookie is created when the javascript library executes and no existing __utmb cookies exists. The cookie is updated every time data is sent to Google Analytics.
__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.
__utmz 6 months from set/update Stores the traffic source or campaign that explains how the user reached your site. The cookie is created when the javascript library executes and is updated every time data is sent to Google Analytics.
__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.
_ga 2 years Used to distinguish users.
_gat 10 minutes Used to throttle request rate.
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