Incredibly, the Equality Act does not prohibit discrimination against an individual because she or he is single. Singles pay more for everything from car insurance to gym facilities. Hotels charge a single room supplement even though single rooms are often worse. Married couples benefit from the marriage tax allowance. It is wrong in principle that to discriminate against someone because they are married is illegal but to discriminate against someone because they are single is not.
Why is this important?
Without this, singles will be wide open to discrimination in employment, housing, credit facilities, leisure facilities etc.