You may be able to ask for a judicial review if you're unhappy with how a public body has made a decision. This can be a long and expensive process and there's no guarantee that the decision will be changed. You'll need legal advice if you want to apply for a judicial review. Speak to an independent advice agency who may be able to refer you to the Law Centre for more assistance.
You may need to go to court to resolve a housing problem you're having. The type of court you use will depend on your case. You will need a solicitor to help you with most court cases, but you don't need one for Small Claims Court.