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You do have a responsibility at some level, whether or not you are the designer or the commissioner of the website, to ensure your website design does not discriminate against disabled visitors to your site.

Quite simply, it is not possible to provide a definitive specification for a fully accessible website which will satisfy the requirements of the UK DDA and asking a web designer to design a website that is "DDA-compliant" or "compliant with the law" is impossible. However, you do leave yourself open to criticism, bad press and and more seriously legal action if your site is not accessible.