According to the report, many UK firms are failing online users

According to internet company Nomensa, 75% of the FTSE 100 companies it tested did not meet the minimum requirements of the Disability Discriminations Act.

The main complaint was not letting users increase text size, which can exclude people with sight problems.

Other problems included a lack of text descriptions for pictures, text-heavy pages, and too much use of jargon.

Grading system

Five most common flaws Poor quality web code Poor use of lists Not using headings and lists Missing alternative text for graphical elements Using pop-up windows Source: Nomensa

Nomensa is a company that creates websites. It said its research found problems across all the major industries.

It did, however, single out some companies as being ahead of their peers, including Marks & Spencer, Sainsbury, Alliance & Leicester, Royal Sun & Alliance, Yell Group, Rentokil, and GlaxoSmithKline.

The best-performing were Daily Mail General Trust and Xstrata, which missed out on a double AA rating by one point. None of the websites tested achieved a double or triple A rating.