To make easier to use, we place small files on your device (for example your iPad or laptop) called cookies. Most big websites do this too.

Cookies improve things by:

  • remembering the things you’ve chosen while on our website, so you don’t have to keep re-entering them whenever you visit a new page
  • remembering data you’ve given (for example, your address) so you don’t need to keep entering it
  • measuring how you use the website so we can make sure it meets your needs

By using our website, you agree that we can place these types of cookies on your device. 

We don’t use cookies on this website that collect information about what other websites you visit (often referred to as privacy intrusive cookies).

Our cookies aren’t used to identify you personally. They’re just here to make the site work better for you. You can manage and/or delete these files as you wish.

Find out more about how to manage cookies.

Cookies used on

The table below explains the cookies we use and why:

Cookie Name Purpose Expires
Universal Analytics _ga This helps us count how many people visit by tracking if you’ve visited before. 2 years

_gid This helps us count how many people visit by tracking if you’ve visited before. 24 hours

_gat Used to manage the rate at which page view requests are made. 10 minutes
Google Analytics _utma Like _ga, this lets us know if you’ve visited before, so we can count how many of our visitors are new to or to a certain page. 2 years

_utmb This works with _utmc to calculate the average length of time you spend on 30 minutes

_utmc This works with _utmb to calculate when you close your browser. When you close your browser

_utmz This tells us how you reached (for example from another website or a search engine). 6 months
YouTube videos _use_hitbox This is a randomly generated number that identifies your browser. When you close your browser

VISITOR_INFO1_LIVE Lets Youtube count the views of embedded Youtube videos. 9 months
ASP.NET ASP.NET_SessionId How and why session IDs are reused in ASP.NET - Microsoft  
Hotjar _hjIncludedInSample This session cookie is set to let Hotjar know whether that visitor is included in the sample which is used to generate Heatmaps, Funnels, Recordings, etc. 365 days
Siteimprove analytics nmstat This cookie is used to help record visitors' use of the website. 1000 days

siteimproveses This cookie is used purely to track the sequence of pages a visitor looks at during a visit to the site. When you close your browser

szcookiechoice This cookie is used to determine if the user has accepted or declined cookies. When you close your browser

_cfduid This cookie is set by the CloudFlare service to identify trusted web traffic. Persistent cookie

Page last updated: 19 October 2018
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