The web server will automatically create one to help keep track of your session on the website.
This stops the web address from being long and difficult to read.
The cookie does not store any personal information.
Cookies are not executable programs. This website does not serve any executable programs to any users for any purpose.
(Note: because we make so little use of it, iff someone somehow managed to
get hold of your cookie, they could not use it to gain any of your personal
We use Google Analytics to track usage of the site.
If you want, you can opt out of Google Analytics on the Google website (there's
many ways, but one is the browser add-on).
We do do some server log file analysis, but this is basically to check nobody is hacking our systems, that search engines can find the site OK, and that all our systems are running smoothly.