Accessibility

This site aims to meet the Web Content Accessibility Guidelines (WCAG) 2.2 at level AA.

What we have done

Text and controls meet the AA contrast requirements in both light and dark colour schemes, and the site follows your device's choice of scheme.
Everything can be reached and used with a keyboard, with a visible focus indicator, and there is a link to skip straight to the main content.
Pages have a single main heading, a logical heading structure and labelled navigation regions.
Text can be enlarged to 200% and pages reflow to a single column on narrow screens without horizontal scrolling.
The typefaces were chosen for legibility: Atkinson Hyperlegible Next, designed by the Braille Institute, and Literata, designed for long-form reading on screens. Both are served from this site.

Many of the articles were written between 1999 and 2014. Some of their figures are images of charts or screens whose descriptions are shorter than they should be.
Some older downloads (PDFs and recorded webinars) were produced before current accessibility practice and may not be tagged or captioned.

If something on this site is hard to use, please say what and where through the contact form. We aim to reply within five working days.

This statement was prepared on 29 October 2026.