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This website uses cookies. Cookies are small text files that are sent by web servers and stored on visitors computers so they can be read back later. They are a convenient way of allowing a computer to remember specific information relating to a website and provide a better user experience.

The cookies we use on this site are 'analytical' cookies, created by Google Analytics, to track basic anonymous information. These cookies are unobtrusive and allow both the website to function and us to obtain information about the usage of our site. This includes data such as the number of visits, the duration of each visit and the path taken by the user around the site. This allows us to improve the way our website works by, for example, gauging the most popular pages.

Cookie names

# Cookie name Expiration Time Description
1  _ga 2 years Google Analytics – used to distinguish users.
2  _gid 24 hours Google Analytics – used to distinguish users.
3  _gat 1 minute Google Analytics – used to throttle request rate.
4  has_js Browser session only Small vessel disease – used to remember JavaScript capabilities.

How to opt-out

Your browser may be capable of being programmed to reject cookies, or to warn you before downloading cookies, and information regarding this may be found in your browser’s ‘help’ facility. For an explanation of cookies see the All About Cookies website.

You can opt-out of Google Analytics by downloading and installing the following browser add-on: Google Analytics Opt-out Browser Add-on

N.B. Available for Microsoft Internet Explorer 11, Google Chrome, Mozilla Firefox, Apple Safari and Opera.