We sometimes collect anonymous information from visits to our site to help us provide a better service.

For example, we keep track of the domains from which people visit and we may also measure visitor activity on the Pythagoras website, but we do so in ways that keep the information anonymous.

We use the information that we collect to measure the number of visitors to the different areas of our site, to look at pages that users appear to be finding useful (and those they may not), and to monitor what devices our website is being viewed on in order for us to ensure that our site is usable on as many devices as people are using to view it.

This includes analysing these logs periodically to measure the traffic through our servers, the number of pages visited and the level of demand for pages and areas of interest. The logs may be preserved indefinitely and used at any time and in any way to prevent security breaches and to ensure the integrity of the data on our servers.

We collect this anonymous information through the use of various technologies, one of which is called “cookies”. A cookie is a small text file that a website can send to your browser, which may then be stored on your hard drive.

The Pythagoras websites use 7 cookies to facilitate user experience and anonymous visitor metrics:

5 third party cookies are set by Google Analytics (GA) – We use GA to gather anonymous information about website visitors to help us make our website experience better. We also use GA in conjunction with site search data to identify how often content is searched for and accessed. Allowing us to improve existing content and identify where new content is required.

We do not use this information to target advertisements or pass any data to third parties. The site will function without GA cookies. To disable the GA cookies in your browser please follow this link.

Google Analytics Cookies

The following GA cookies are used on the site:


This is written the first time a visitor visits the site. It’s updated with each visit and helps identify the unique visitors. It expires 2 years from the last update.


This is a session cookie that is updated with each page view or event. It’s used to establish and continue a user session within the site and expires 30 minutes after the last update or visitor inactivity.


This cookie stores the type of referral used by the visitor to reach the site. The cookie is updated with each page view. It is used to calculate traffic drivers e.g. search engine traffic, ad campaigns, and navigation within the site. It expires 6 months from set/update.


This cookie stores the custom variable information that you set in your code. It is used to set and pass custom variable information to the GA server. It expires 2 years from set/update.


This is a Google Website Optimizer cookie and won’t show up if the site isn’t using GWO. It stores the variation a particular visitor is assigned to for each experiment so that the visitor continues to see the same variation in his/her visit. It expires 2 years from set/update.

Other Cookies

We also use a first party cookie to handle any form reloads. This also helps us to display friendly URLs to make site links easier to communicate. This first-party cookie is not considered an opt-in cookie.

In addition to cookies that we set, 3rd party social media cookies may be set (for example by Facebook and Twitter) when you use these features. Please see the specific sites for details.

Please visit About Cookies if you’d like to find out more about managing cookies