If you have a complaint about NHS services, it's important to address it promptly. You should first speak to the staff involved in your care, as they may be able to resolve the issue directly. If you are not satisfied with the response, you can escalate the complaint to the Patient Advice and Liaison Service (PALS) at the hospital or your GP practice. They can help guide you through the formal complaint process. Remember, your feedback is valuable for improving NHS services.