We use cookies to help understand how people use this website and to enhance their experience of it by, for example, capturing which pages are most popular, how long people spend on each page and what links they use to access the information they are seeking.

On occasion, we may embed content from another website, for example a YouTube video. You may be presented with cookies from the third-party website when using a page with this content. We do not control the dissemination of these cookies. You should check the third-party websites for more information about these.

You can set your browser to warn you before accepting cookies, or you can set it to automatically reject them. Rejecting cookies may inconvenience you in browsing our website.

How we use cookies

Cookies are small text files that are placed on your computer by websites that you visit. They are widely used in order to make websites work more efficiently and sometimes provide useful information to the owners of the site.

There are some cookies necessary to this site functioning, such as interacting with our accessibility toolbar. These cookies will usually remove themselves when you close your browsing session. More information can be found in the ‘Necessary cookies’ section.

We use some additional cookies, such as Google Analytics, to help us gather information and improve the website. You have the option to deny use of these cookies; more information can be found in the ‘Additional cookies’ section.

You can find more information on managing and deleting cookies on About Cookies.

Necessary cookies

The following cookies are necessary to our site functioning.

Cookie

Purpose

Expiry

cookieconsent_status

Persistently records your options regarding additional cookies

1 year

Necessary accessibility cookies

The following necessary cookies allow the functions among our accessibility tools to work optimally.

Cookie Purpose Expiry
accessibility-controls Records option regarding additional cookies End of browsing session
saveFontSize Allows the website (CMS) to record if the user's font size selection End of browsing session
contrast-mode Allowss the website (CMS) to record the user's contrast mode selection End of browsing session
googtrans Allows the language of page content to be changed and records the language selected End of browsing session

Additional cookies

In order to help us to improve the content, format, and structure of this website we record and analyse how visitors use the using Google Analytics.

You can read Google’s extensive information on data practices in Google Analytics.

You can opt-out of Google Analytics on our website by denying additional cookies or by using the Google Analytics Opt-out Browser Add-on.

Cookie Purpose Expiry
_ga Distinguishes user for Google Analytics 2 years
_gid Distinguishes user for Google Analytics 1 day
_gat Throttles request rate for Google Analytics 1 minute
_ga_{ID} Persists session state for older versions of Google Analytcis 2 years
_gat_gtag_UA_{ID} Persists session state for older versions of Google Analytics 1 minute
__utma Distinguishes user and session for Google Analytics 2 years
__utmb Determines new session or visit for Google Analytics 30 minutes
__utmc Determines new session or visit for Google Analytics End of browsing session
__utmz Stores traffic sources for Google Analytics 6 months