Use of cookies by this website

Cookies are small text files that are placed on your computer when you visit a website.

They are used for various purposes. Some are essential, and in most cases if these are not used the website will not work properly. Some are optional. The list below describes the cookies used by this website and what they are for.

Cookie preferencewbcookiecontrolUsed to remember your choice about optional cookies on this site.
NavigationPHPSESSIDUsed to remember which page you are viewing and previous pages viewed. It is also used to allow you to log into a members area on this site if this facility is switched on.
DisplayscreenSizeUsed to help make this site responsive. If this cookie is not used when needed the website will not display properly.
Image HandlingThis domainThis website uses local storage and session storage within your browser cache to work out what order to display images in animation sequences and how to order images that appear in lists. Images on this site tend to be of higher quality and these do require bandwidth to display. This site uses these stores to decide which images to display and which not based on what you are looking at. Without this storage support, performance of this site may be seriously impaired when available bandwidth is low.
Universal Analytics (Google)
_ga, _gali, _gat
_gid,_utma, _utmb
_utmc, _utmt, _utmv
Google Analytics use a number of different cookies, at different times, which are used to collect information about how visitors view our website. The data collected is anonymous. Google also uses local storage and session storage. We use the information to work out what content is useful and viewed and what is not, so that we can improve the website for you. Read the Google Analytics use of cookies policy here

Changing cookie preferences

You can change cookie preferences at any time using the ‘C’ widget link on the bottom right of the screen.

Also, most web browsers allow you to change cookie settings too. To find out more about cookies visit