They are for:
Your Session: We create cookies to store your visit session, which in turn stores your basket and a key for your active log in.
Google Analytics: Our use of Google Analytics creates third party cookies. Google Analytics helps us track your use of our website so we can continually improve our service. Use of Google Analytics is again, standard industry practice.
Social Sharing: The third party social sharing service we use creates cookies. As they are created by a third party we do not control the content of these cookies, however, we can assure you that using this software is very much standard industry practice.