This site uses cookies – small text files that are placed on your machine to help the site provide a better user experience.

Most websites use cookies. Cookies improve things by:

  • remembering settings, so you don’t have to keep re-entering them whenever you visit a new page.
  • remembering information you’ve given (e.g. your email address) so you don’t need to keep entering it.
  • measuring what users do on a website to ascertain which parts of a website are popular, how long users spend on a website, how often they return, where they come from etc.

Our cookies aren’t used to identify you personally. Users can set their browsers to accept or reject all, or certain, cookies. To learn more about cookies and how to manage them, visit

How we use cookies

We use cookies to measure website usage through Google Analtics. We do this to make sure it’s meeting users’ needs and to understand how we could make it better. Google Analytics stores information about what pages you visit, how long you are on the site, how you got here and what you click on. We do not collect or store your personal information so this information cannot be used to identify who you are. The table below shows the cookies we use, why we use them and how long they will last. The following cookies are set by Google Analytics:

_utma This randomly generated number is used to determine unique visitors to our site
Expires: 2 years

_utmb This randomly generated number works with _utmc to calculate the average length of time users spend on our site
Expires: 30 minutes

_utmc This randomly generated number works with _utmb to calculate when you close your browser
Expires: when you close your browser

_utmz This is a randomly generated number and information about how the site was reached (e.g. direct or via a link, organic search or paid search)
Expires: 6 months

You can opt out of Google Analytics cookies by visiting this page on Google