Keep a clear record of what happened, including dates, people involved, contracts, policies, emails and messages. Check your employment contract and workplace grievance procedure, then consider raising the issue informally or in writing with your manager or HR. ACAS offers free guidance and may help with early conciliation, but employment tribunal time limits can be short—often three months less one day, depending on the claim. For serious or complicated issues, consider speaking to a solicitor regulated by the SRA or another suitably qualified adviser.