Cookies are small text files that are placed on your computer by websites that you visit. They are widely used in order to make websites work, or work more efficiently, as well as to provide information to the owners of the site. The table below explains the cookies we use and why.

Cookie Name Purpose
Cookie preference Cookie Control This cookie is used to remember a user’s choice about cookies on Where users have previously indicated a preference, that user’s preference will be stored in this cookie.
PHP session cookie PHPSESSID This cookie is essential for the functionality of the website; it is used to establish a user session and is deleted when you close your browser.
Universal Analytics (Google) _utma

This cookie is typically written to the browser upon your first visit to this site. If the cookie has been deleted by the browser operator, and the browser subsequently visits this site, a new cookie is written with a different unique ID. This cookie is used to determine unique visitors and it is updated with each page view. It is a persistent cookie that expires 2 years from the last update. Additionally, this cookie is provided with a unique ID that Google Analytics uses to ensure both the validity and accessibility of the cookie as an extra security measure.

  _utmb/ _utmc
These cookies work in tandem to calculate visit length and to establish and continue a user session within this site. When you view a page on this site, the Google Analytics code attempts to update this cookie. If it does not find the cookie, a new one is written and a new session is established. Each time you visit a different page on this site, this cookie is updated to expire in 30 minutes, thus continuing a single session for as long as your activity continues within 30-minute intervals. This cookie expires when you pause on a page on this site for longer than 30 minutes.
  _utmt This cookie is used to throttle request rate and is stored for 10 minutes.
  _utmz This cookie stores information about how the site was reached, whether via a direct method, a referring link, or a website search. This cookie lasts six months and updates with each page view to the site.
Vimeo player This is a preference cookie set by Vimeo which stores your preferences for viewing Vimeo videos.
Google translation language googtrans Valid for the user session this cookie remembers your chosen language between page loads

For further information on how Google uses cookies, you can visit: How Google uses cookies – Privacy & Terms – Google

How do I change my cookie settings? 

You can change your cookie preferences at any time by clicking on the ‘C’ icon. You can then adjust the available sliders to ‘On’ or ‘Off’, then clicking ‘Save and close’. You may need to refresh your page for your settings to take effect.  

Alternatively, 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, visit or

Find out how to manage cookies on popular browsers:

To find information relating to other browsers, visit the browser developer's website.

To opt out of being tracked by Google Analytics across all websites, visit

Links to other websites

Our website may contain links to other websites of interest. However, once you have used these links to leave our site, you should note that we do not have any control over that other website. Therefore, we cannot be responsible for the protection and privacy of any information which you provide whilst visiting such sites and such sites are not governed by this privacy statement. You should exercise caution and look at the privacy statement applicable to the website in question.