For more general information on cookies see the Wikipedia article on HTTP Cookies.
You can prevent the setting of cookies by adjusting the settings on your browser (see your browser Help for how to do this). Be aware that disabling cookies will affect the functionality of this and many other websites that you visit. Disabling cookies will usually result in also disabling certain functionality and features of this site. Therefore it is recommended that you do not disable cookies.
This site offers newsletter or email subscription services and cookies may be used to remember if you are already registered and whether to show certain notifications which might only be valid to subscribed/unsubscribed users. This site offers e-commerce or payment facilities and some cookies are essential to ensure that your order is remembered between pages so that we can process it properly. When you submit data to through a form such as those found on contact pages or comment forms cookies may be set to remember your user details for future correspondence.
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Hopefully that has clarified things for you and as was previously mentioned if there is something that you aren't sure whether you need or not it's usually safer to leave cookies enabled in case it does interact with one of the features you use on our site. However if you are still looking for more information then please contact us.