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Accessibility statement

For practical help in using this website, such as information on Access Keys and text resizing, see the site help section.

Standards compliance

Our pages are intended to satisfy Web Accessibility Initiative (WAI) Conformance Level "Double-A": following Priority 1 and 2 checkpoints of the Web Content Accessibility Guidelines 1.0.


This site uses 'portable document format' (.pdf) files. In order to view these documents you may need Adobe Acrobat Reader software. This software is included on many systems but if it is not on yours you can go to the Adobe site and download it for free.


For playing MP3 audio and video files on this site we use Adobe Flash. For those without Flash, audio files are available for download and playback on your local machine.