The House of Commons Library have published an overview of the Public Sector Equality Duty (PSED), contained in section 149 of the Equality Act 2010, and Equality Impact Assessments.
This December 2017 briefing (pdf) summarises the PSED contained in section 149 of the Equality Act 2010, which requires public authorities to have due regard to equality considerations when exercising their functions.
It also provides an overview of Equality Impact Assessments. These are assessments that public authorities often carry out prior to implementing a policy, with a view to determining its potential impact on equality. They are not required by law, although are a way of facilitating and evidencing compliance with the PSED.