The only cookies we set ourselves are created by our use of PHP Session variables to maintain state across the site pages. PHP Sessions create a unique ID for each visitor's browser which is stored in a cookie. The variables themselves are held on the server and linked to this ID. The cookie is merely a reference (it contains no personal information and cannot be used to identify you) and is deleted when you close your browser.
Like many websites we may include functionality, secure purchasing or analytical services provided by third party software which sets its own cookies. The only third party to which we currently link is statcounter.com