Our website runs the popular WordPress CMS and cookies are used to store basic data on your interactions and whether you have logged into WordPress. We use a session cookie to remember your log-in for you if you are a registered user and we deem these as being strictly necessary to the working of the website. If these are disabled then various functions on this site will be broken.
WordPress also collects anonymous data about page visits and and user preferences similar to google analytics, which then allows us to tailor the website and improve your experience.
More information on session cookies and what they are used for at http://www.allaboutcookies.org/cookies/session-cookies-used-for.html