As an employer you must also make sure that you do not „victimise” your employees. 

Victimisation is when someone is treated less favourably as a result of being involved with a discrimination or harassment complaint. Ways someone could be victimised include: being labelled a troublemaker, being left out, or not being allowed to do something.

So, if one of your employees

•    makes a complaint of discrimination or harassment
•    supports someone else's complaint
•    gathers information that might lead to a complaint
•    acts as a witness in a complaint
•    says something or gives evidence that does not support someone else's complaint

you must not treat him less favourably because of this. 

By way of an example, if your employee accuses you of discrimination and in return you demote him, you victimised him under the Equality Act 2010.