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A cookie is a small data file, that is sent to your web browser by a website and is stored on your computer or mobile device.

We will not use cookies to collect personally identifiable information about you and we do not support the placement of cookies by 3rd party advertisers. We may collect web analytics and social media usage from a number of service providers including Google Analytics, Facebook and Twitter. The cookies they use to collate data are outlined in the table below.

Cookie name Purpose
_utma Stores each user's amount of visits, and the time of the first visit, the previous visit, and the current visit. (Google Analytics)
_utmb, _utmc Used to check approximately how long you stay on a site. (Google Analytics)
_utmz Stores where a visitor came from (e.g. search engine, search keyword, link). (Google Analytics)
datr Used to identify the session for tracking purposes. (Facebook)
pid, guest_id Allows content from Twitter to be shown on website pages and pages to be shared on Twitter. (Twitter)
fontsize Saves the accessibility option for font size. Portabolomics
dyslexic Saves the accessibility option for font family. Portabolomics
Please check the 'Help' menu of your browser to learn how to change your cookie preferences. Alternatively, contains comprehensive information on how to do this on a wide variety of browsers. You will also find details on how to delete cookies from your computer as well as more general information about cookies. To opt out of being tracked by Google analytics across all websites visit