These cookies record a visitor’s progress through a browsing session for problem solving and to identify errors in the use of the site that the visitor may experience. They also link a visitor’s actions with website usage and performance. Some cookies identify the visitor’s IP address, browser and device type. We use Analytics to assess how visitors use the website, to understand how visitors arrived at the site (e.g. using keyword searches), to monitor how long visitors remain on the website and when they return, and to control website traffic at busy times.