If you witness someone being bullied, there are some routes you can take, depending on how comfortable you are with taking action as well as the dynamics of the situation.
The first point is never to join in. Bullies love to have an audience and love people to be on their side. If you are a part of a group that has developed a bullying mentality towards an individual, or you witness someone being bullied, please do not take part. Depending on how safe it is and your level of comfortability, perhaps try to diffuse the situation and talk to the bullies about how their behaviour might be harmful to the other person. If this is not something you feel comfortable doing, or if it is unsafe to do so, maybe have a one-on-one conversation with the victim and reassure them that this behaviour is not okay. You can talk them through an action plan, perhaps encouraging them to talk to somebody who will be able to help (at work this may be a manager, at university the Students Union doors are always open for support).
If you are the person being bullied, the same applies. Please come forward to the Students Union, we are here for you, we can help and you are not alone.
Another route is using Report+Support. This is an online platform where you can anonymously report incidents of many natures including bullying or hate crimes. Here you request and access support directly from UCA. They take all incidents seriously and all reports are dealt with sensitively and professionally by their trained teams. You can access Report+Support here.