When you make a complaint, the Registrar must appoint someone to investigate it as soon as possible. You should know that the Registrar does not have to do this if they act under section 90(4). The person investigating must not be on the Board or the person who made the complaint. The investigator must be independent, so they cannot be the person who made the complaint. They also cannot be on the Board that deals with plumbers, gasfitters, and drainlayers. If the investigator works for a local authority, that authority must agree to the appointment first. The Registrar has to choose someone suitable to investigate your complaint. This means the investigator must be impartial and not have any conflicts of interest. They will look into your complaint to find out what happened.