If you’re considering suing the NHS, there is a formal complaints process that you should look into first. Your complaint must be made within 12 months from the date the event happened, or 12 months from the date you first became aware of it. If you need further assistance, you can get help from the Patient Advice & Liaison Service (PALS) whose officers are in most hospitals. If you are unhappy with the response you get, you can complain to the Parliamentary and Health Service Ombudsman.