And from the Home Office's website:
We will not discriminate on grounds of age, caring responsibilities, disability, gender, gender identity, marriage and civil partnerships, part-time working, pregnancy and maternity, race, religion or belief, sexual orientation or any other factor irrelevant to a person’s work.
Spot the protected characteristic that doesn't get a mention and might (or might not) be bundled up with "and any other factor". But gender and gender identity are there, oh yes.
This is why the police are so keen to jump to the tune of people who feel that their gender identity is being slighted. This is why the police remain unaware that 'sex' based rights are covered by the Equality Act - despite what the HOme Office says
www.gov.uk/government/organisations/home-office/about/equality-and-diversity