a24d2281_Digital_UK___Cookies__What_it_is_used_for
[Cookie name] ci_session, SQ_SYSTEM_SESSION, PHPSESSID, ASP.NET_SessionId [What it is used for] 
Allows the site to identify a unique user visit. These do not contain any human readable personal data and are used for website functionality.
Digital UK - Cookies
What it is used for