Enacted in 2010, the Equality Act protects people in the United Kingdom from discrimination based on various characteristics (age, gender, disability, ETC.) in the workplace and in wider society. It is a very comprehensive law that regulates many different, yet related, aspects about discrimination including definitions, complaint procedures, and duties. It applies to both public bodies and private organizations.
With regards to web accessibility, UK Equality Act requires that private website owners do not discriminate against or disadvantage people with disabilities, therefore enforcing the creation of accessible websites and applications.