If an attempt to resolve an issue directly with your employer through informal and formal routes has not worked, then it may be worth using the law. You should take advice before doing this, either from your union, a solicitor or advice agency.
There are a number of different courts and tribunals that can deal with work-related cases. Each also has an appeal route. They are:
There are also legally prescribed alternatives to formal hearings in a court or tribunal, which may be a better way to proceed.