Authorised representative attendance permitted before authorities; registered valuer allowed for immovable property valuation in tax proceedings. Persons entitled or required to attend before a competent authority or the Appellate Tribunal under this Chapter may attend by an authorised representative, except where personal attendance for examination on oath is required. A registered valuer may attend for matters relating to valuation of immovable property and the estimation of any reduction or increase in compensation payable on acquisition under the Chapter. The section relies on statutory definitions for 'authorised representative' and 'registered valuer.'