Standards compliance

  • Most pages on this site comply with all priority 1 and 2 guidelines of the World Wide Web Consortium (W3C) Web Content Accessibility Guidelines. 
  • All other pages meet priority 1 guidelines of the W3C Web Content Accessibility Guidelines. 
  • All pages validate as transitional XHTML 1.0. 
  • All style sheets used on this site validate as CSS. 

Visual design

  • This site uses cascading style sheets for visual layout, meaning greater usability for assistive technology.  
  • You can control the size of the text as you require by either zooming in on your browser or changing the text size by using the text resizing controls within your browser. 
  • If your browser or browsing device does not support stylesheets at all, the content of each page is still readable. 


Links have title attributes that describe the link in greater detail, unless the text of the link already fully describes the target. If you are using a mouse, or other pointing device, these can be viewed by hovering over the link text. 

Pop-up windows

The use of pop-up windows on this site has been kept to a minimum. If a link opens a new browser window then this is explained in the title attribute of the link. 


If you find any page on this site difficult to use, please let us know.